!Bake the tomatoes while you prepare the gravy: To bake the tomatoes, preheat the oven to 400 degrees. Slice the tomatoes into thick, approximately 1/2†slices. Place on a baking sheet drizzled with half the olive oil. Drizzle the remaining olive oil over the tomato slices and sprinkle with Herbs de Provence, garlic powder, salt, and pepper. Bake for about 10 minutes or until softened and just beginning to brown. !To make the sausage gravy: Add the sausage to a large skillet over medium high heat. Break the sausage up as it cooks using a wooden spoon or potato masher. Cook until no pink color remains. Sprinkle over the flour and cook, stirring constantly, for 1 to 2 minutes. Gradually add the milk, stirring constantly, and cook until thickened. Taste and add salt and pepper if needed. Serve the gravy over warm biscuits with the tomato slices on the side.