Preheat the oven to 425°F

Mix flour, baking powder, baking soda, salt, and cold butter for the biscuits

Add buttermilk and stir until just combined

Drop or roll the dough and cut into biscuits

Place biscuits on a baking sheet

Bake until golden brown

Cook breakfast sausage in a skillet over medium heat

Add flour to the cooked sausage and stir

Slowly pour in milk while stirring

Cook until the gravy thickens

Season the gravy with salt and black pepper

Split the biscuits in half

Spoon the gravy over the biscuits