Step 1: Make the Gravy

Cook the sausage in a large skillet over medium heat until browned, breaking it into small pieces. Sprinkle the flour over the sausage, stir well, and cook for about 2 minutes.

Gradually pour in the milk while stirring constantly. Increase the heat to medium-high to bring the mixture to a boil. Once it boils, reduce the heat and let it simmer until the gravy thickens, about 5 minutes.

Season with salt, black pepper, sage, and red pepper flakes if using.

Step 2: Prepare the Puff Pastry

Preheat your oven to 375°F (190°C). Roll out one sheet of puff pastry and place it into a 9-inch pie dish, letting the edges hang over slightly.

Step 3: Assemble the Pie

Pour the sausage gravy into the pastry-lined pie dish and spread it evenly. Roll out the second sheet of puff pastry and lay it over the top.

Trim any excess pastry, then crimp the edges to seal the top and bottom crusts together. Cut a few small slits in the top to let steam escape.

Step 4: Bake

Place the pie on the middle oven rack and bake for 25-30 minutes, until the pastry is golden brown and flaky.

Step 5: Cool and Serve

Let the pie cool for a few minutes before slicing into it. Serve warm and enjoy every hearty, flaky bite!