Make the biscuits the night before stuffing them.
Line a baking sheet with parchment paper and set aside.
In a large bowl, whisk together flour, baking powder and salt.
Cut the butter into ½ inch cubes, and place it in the freezer for 20 minutes so it’s extremely cold.
Smash the butter into the flour using a pastry cutter, two forks or your hands until the butter is evenly distributed and pea sized balls have formed.
Slowly stream the heavy cream into the flour and butter mixture while using a fork to evenly distribute the liquid.
Gently mix the flour mixture and heavy cream until a shaggy dough has formed.
Turn the dough out onto a lightly floured surface.
Knead the dough until it just comes together, and form it into a rough rectangle.
Roll the dough into a ½ inch thick rectangular slab.
Carefully fold the dough into thirds until it overlaps onto itself like a letter or trifold.
Gently compress the layers, then roll the dough into a rectangle that is ¾ of an inch to 1 inch thick.
Lightly flour the sharp end of a 4 inch round cookie cutter and punch out as many biscuits as possible and transfer to a parchment lined baking sheet.
Gather and reroll the scraps and punch out more biscuits until the remaining scraps can’t be rerolled, and press the last scraps into a free-form biscuit.
Cover the tray tightly with plastic wrap or an inverted baking tray, and store in the fridge overnight.
The next morning, cook the sausage over medium-high heat until browned and crispy, and transfer to a paper towel lined plate; drain any excess fat and let cool completely.
Whisk the eggs until the yolks and whites are homogenous, and scramble over medium-low heat with 1-2 tablespoons of butter until the eggs have reached a soft to medium scramble.
Season the eggs with a pinch of salt and black pepper to taste, and transfer to a plate to cool completely.
Preheat the oven to 400F.
Once the eggs and sausage have completely cooled, remove the biscuit tray from the fridge.
Working quickly, but carefully, elongate and flatten the biscuits by pinching the sides while turning them in your hand.
Place 1 tablespoon of cheddar in the middle of a biscuit, followed by 2 tablespoons of eggs and 1 tablespoon of sausage, then top with 1 more tablespoon of cheddar.
Bring the edges of the biscuit together, and close the biscuit by pinching the dough until the filling is completely encased in the biscuit.
Place the biscuit seam side down on the baking sheet and repeat with the rest of the biscuits.
Transfer the biscuit tray to the freezer and let them rest for 20 minutes to firm up the butter.
Brush the biscuits with heavy cream, and optionally, sprinkle with flaky salt.
Bake for 15-20 minutes or until the biscuit tops are golden brown.
Transfer to a wire rack and let cool for 5 minutes, then serve and enjoy!