Preheat oven to 400°F and line a sheet pan with parchment paper.
Cook onion and bell pepper, then add turkey sausage, season, and cook until browned; let cool slightly.
Whisk eggs, then mix in turkey mixture and 1 cup cheese.
Add flour and baking powder; mix into a thick dough (do not overmix).
Scoop into 12 biscuits, flatten slightly, and top with remaining cheese.
Bake 15–18 minutes until golden and fully set.
