To prepare a stuffed polenta with meat sauce beef recipe, first you need to prepare the meat. First, you'll need the following ingredients: 1 pound ground beef 2 tbsp. kosher salt 1/2 cup melted butter 1 1/2 cups sour cream 1 teaspoon thyme 2 tablespoons olive oil 1 tablespoon buttermilk Instructions Preheat the oven to 425 degrees F. Line 2 baking sheets with foil or parchment paper. Pour the milk into the bottom of the foil-lined pan and heat over medium-high heat, whisking constantly, until thickened and bubbly. Add the beef and cook, stirring occasionally, for 5 minutes. Remove the pan from the heat and stir in the shredded cheese. Cook until the cheese melts and the sauce thickens, about 2 minutes more. Stir in 1 cup chopped parsley. Spoon the stuffing into each prepared baking sheet. Bake for 20 minutes or until golden brown. Serve warm.