Quick Recipe Version (TL;DR)
Quick Ingredients
- 1 tablespoon unsalted butter
- 1/2 medium yellow onion, thinly sliced
- 6 ounces breakfast sausage
- 5 large eggs
- 2 tablespoons whole milk
- 1/4 teaspoon kosher salt
- 1/4 teaspoon ground black pepper
- 1 tablespoon chopped fresh chives
- 1 teaspoon fresh thyme leaves
- 1 cup shredded sharp cheddar cheese
- 3 cups all-purpose flour
- 1 tablespoon baking powder
- 1/2 teaspoon baking soda
- 1 teaspoon granulated sugar
- 1 teaspoon kosher salt
- 10 tablespoons cold unsalted butter, cubed
- 1 cup cold buttermilk
- 1 large egg mixed with 1 tablespoon water, for egg wash
Do This
- 1. Cook the onion in 1 tablespoon butter over medium-low heat for 22 minutes, until deeply golden.
- 2. Brown the sausage for 7 minutes, breaking it into small crumbles.
- 3. Softly scramble 5 eggs with the milk, salt, and pepper for 3 minutes; combine with the onion, sausage, chives, and thyme, then cool.
- 4. Heat the oven to 425°F and line a baking sheet with parchment paper.
- 5. Mix the dry biscuit ingredients, cut in 10 tablespoons cold butter, stir in the buttermilk, and fold the dough three times.
- 6. Divide the dough into 8 portions; fill each with 3 tablespoons egg mixture and 2 tablespoons cheddar, then seal.
- 7. Brush with egg wash and bake for 20 minutes, until puffed and golden; cool for 5 minutes before serving.
Why You’ll Love This Recipe
- Every biscuit combines a flaky, buttery exterior with a complete savory breakfast inside.
- The filling can be prepared ahead, making morning assembly easier.
- The sealed biscuits are portable, freezer-friendly, and convenient for busy mornings.
- Caramelized onions, sharp cheddar, sausage, and fresh herbs give the filling plenty of flavor.
Grocery List
- Produce: 1 medium yellow onion, fresh chives, and fresh thyme
- Meat: 6 ounces breakfast sausage
- Dairy: 12 tablespoons unsalted butter, 6 large eggs, whole milk, buttermilk, and 4 ounces sharp cheddar cheese
- Pantry: All-purpose flour, baking powder, baking soda, granulated sugar, kosher salt, and ground black pepper
Full Ingredients
For the Sausage and Egg Filling
- 1 tablespoon unsalted butter
- 1/2 medium yellow onion, thinly sliced into half-moons, about 3/4 cup
- 6 ounces uncooked breakfast sausage, casings removed if necessary
- 5 large eggs
- 2 tablespoons whole milk
- 1/4 teaspoon kosher salt
- 1/4 teaspoon ground black pepper
- 1 tablespoon finely chopped fresh chives
- 1 teaspoon fresh thyme leaves
- 1 cup shredded sharp cheddar cheese, about 4 ounces
For the Flaky Biscuit Dough
- 3 cups all-purpose flour, spooned and leveled, about 360 grams
- 1 tablespoon baking powder
- 1/2 teaspoon baking soda
- 1 teaspoon granulated sugar
- 1 teaspoon kosher salt
- 10 tablespoons cold unsalted butter, cut into 1/2-inch cubes, about 142 grams
- 1 cup cold buttermilk, about 240 milliliters
For Finishing
- 1 large egg
- 1 tablespoon water
- 1 teaspoon finely chopped fresh chives, optional
Step-by-Step Instructions
Step 1: Caramelize the onion
Melt 1 tablespoon butter in a 10-inch skillet over medium heat. Add the sliced onion and spread it into an even layer. Cook for 3 minutes, stirring once, then reduce the heat to medium-low. Continue cooking for exactly 19 minutes, stirring every 3 to 4 minutes, until the onion is soft, reduced in volume, and deep golden brown. If the skillet becomes dry, add 1 teaspoon water and scrape up the browned bits. Transfer the caramelized onion to a large plate.
Step 2: Brown the breakfast sausage
Return the skillet to medium heat. Add the breakfast sausage and cook for 7 minutes, breaking it into small crumbles with a wooden spoon. The sausage should be well browned with no pink remaining and should reach an internal temperature of 160°F. Transfer it to the plate with the onion using a slotted spoon. Carefully wipe excess grease from the skillet, leaving a light coating behind.
Step 3: Softly scramble the eggs
Crack 5 eggs into a medium bowl. Add the milk, 1/4 teaspoon kosher salt, and black pepper, then whisk until the whites and yolks are fully blended. Set the skillet over medium-low heat and pour in the eggs. Cook for 3 minutes, folding gently with a silicone spatula, until the eggs form soft curds but still look slightly glossy. They should be a little underdone because they will finish cooking in the oven.
Remove the skillet from the heat. Fold in the caramelized onion, cooked sausage, 1 tablespoon chives, and thyme. Spread the filling on the large plate and let it cool for 10 minutes. Cooling is important because a hot filling will soften the butter in the biscuit dough.
Step 4: Heat the oven and prepare the pan
While the filling cools, position a rack in the center of the oven and preheat the oven to 425°F. Line a large rimmed baking sheet with parchment paper. Whisk the remaining egg with 1 tablespoon water in a small bowl to make the egg wash, then set it aside.
Step 5: Make the flaky biscuit dough
In a large mixing bowl, whisk together the flour, baking powder, baking soda, sugar, and 1 teaspoon kosher salt. Add the cold butter cubes and toss to coat them in flour. Use a pastry cutter or your fingertips to cut the butter into the flour until most pieces are about the size of small peas, with a few larger flat pieces remaining.
Pour in the cold buttermilk. Stir gently with a fork just until a shaggy dough forms and no large pockets of dry flour remain. Do not knead the dough until smooth; a rough dough produces lighter, flakier biscuits.
Step 6: Fold and divide the dough
Turn the dough onto a lightly floured work surface and gently press it into an 8-by-12-inch rectangle. Fold the top third down over the center, then fold the bottom third up as if folding a letter. Rotate the dough 90 degrees, gently press it back into a rectangle, and repeat the letter fold two more times. These three folds create distinct buttery layers.
Shape the folded dough into an 8-inch square. Cut it into 8 equal portions. Keep the portions you are not actively shaping loosely covered so they do not dry out.
Step 7: Fill and seal the biscuits
Working with one dough portion at a time, gently flatten it into a circle about 5 1/2 inches wide. Keep the center slightly thicker than the edges. Place 3 level tablespoons of the cooled egg and sausage mixture in the center, followed by 2 loosely packed tablespoons of shredded cheddar.
Lift two opposite edges of the dough over the filling and pinch them together. Bring up the remaining edges, pinching firmly until the filling is completely enclosed. Turn the biscuit seam-side down and gently cup it with your hands to form a rounded shape. Place it on the prepared baking sheet. Repeat with the remaining dough and filling, spacing the biscuits about 2 inches apart.
Step 8: Brush and bake until golden
Brush the tops and exposed sides of the biscuits lightly with the egg wash. Use the tip of a sharp knife to make a 1/4-inch steam vent in the top of each biscuit. Bake at 425°F for 20 minutes, rotating the pan after 10 minutes, until the biscuits are puffed and deeply golden. The center of the filling should reach at least 165°F.
Transfer the biscuits to a wire rack and let them cool for 5 minutes. Sprinkle with the optional chopped chives and serve warm. Allow them to cool for at least 15 minutes before packing for a portable breakfast so trapped steam does not make the bottoms soggy.
Pro Tips
- Keep everything cold: Cold butter and buttermilk create steam in the oven, which separates the dough into flaky layers.
- Cool the filling: Spread the cooked filling into a thin layer so it cools quickly without continuing to cook the eggs.
- Do not overfill: Use level tablespoons and leave a clean border around the filling so the dough can form a secure seal.
- Seal firmly: Pinch the seams without thinning the dough. Patch any small tears with a scrap of dough before baking.
- Shred cheese from a block: Freshly shredded cheddar melts more smoothly than cheese coated with anti-caking powder.
Variations
- Bacon and scallion: Replace the sausage with 6 ounces of cooked, crumbled bacon and replace the thyme with 2 tablespoons sliced scallions.
- Vegetarian: Omit the sausage and sauté 6 ounces finely chopped mushrooms with the onion. Add 1/2 cup chopped baby spinach during the final 2 minutes of cooking.
- Spicy Southwest: Use pepper jack in place of cheddar and add 1 finely chopped jalapeño and 1/2 teaspoon ground cumin to the filling.
Storage & Make-Ahead
Let leftover biscuits cool completely, then refrigerate them in an airtight container for up to 4 days. Reheat refrigerated biscuits on a baking sheet in a 350°F oven for 12 minutes, or microwave one biscuit for 60 to 90 seconds. To freeze, wrap each cooled biscuit tightly and place the wrapped biscuits in a freezer-safe container for up to 2 months. Reheat directly from frozen in a 350°F oven for 20 to 24 minutes, until hot in the center. The sausage, onion, and egg filling can be cooked up to 2 days ahead and refrigerated in a covered container. For an even faster morning, assemble the unbaked biscuits, freeze them on a tray until solid, and transfer them to a freezer bag. Brush the frozen biscuits with egg wash and bake at 425°F for 27 minutes.
Nutrition (per serving)
Calories: 510 kcal | Carbs: 39g | Protein: 18g | Fat: 31g | Saturated Fat: 16g | Fiber: 2g | Sugar: 4g | Sodium: 760mg | Cholesterol: 190mg
