Step 1: Prepare the Sausage – Preheat oven to 425°F (220°C). Cook sausage in a skillet over medium-high heat (6-8 mins) until browned. Drain grease (keep 1 tbsp) and let cool.
Step 2: Make the Biscuit Dough – Whisk flour, baking powder, salt, garlic powder, and pepper. Work cold butter into the flour until it looks like coarse crumbs with pea-sized pieces.
Step 3: Combine – Fold cooled sausage into the flour. Make a well, add milk, and stir with a fork until just combined (don't overmix).
Step 4: Shape – Pat dough into a 3/4-inch thick rectangle on a floured surface. Cut into 8 squares. Place on a parchment-lined baking sheet.
Step 5: Finishing Touches – Brush with egg wash. Add cheese or seasoning if desired.
Step 6: Bake – Bake for 15-18 minutes until golden brown. Cool for 5 minutes before serving.