Add the butter and oil: Sprinkle the top of the sausage and vegetables with small cubes of butter (2 tablespoons total). Drizzle all the ingredients evenly with olive oil.
Seasoning: Sprinkle oregano, basil, and black pepper evenly over the top of the mixture.
Cook, covered: Cover the pan tightly with a lid or aluminum foil.
Bake: Bake in the preheated oven for 40 to 50 minutes, or until the potatoes are tender and cooked through.
To serve: Carefully remove the pan from the oven. Serve the smoked sausage and potato gratin hot. Enjoy this simple and tasty meal!
My mom used to do this and it was delicious! I'm glad I found it
