Pasta & Pizza with tomatoes

3 tablespoons butter , divided 1/2 cup chopped onion 4 cloves garlic , minced 1 (14 ounce) can tomato sauce 2 cups sliced fresh mushrooms 1/4 cup chopped[...]

1 lb dry penne pasta , prepared according to package directions 8 ounces lean ground beef 1 onion , chopped 3 garlic cloves , finely chopped 1 (12 ounce) can[...]

1 lb ground beef 1 (16 ounce) can tomato sauce 1 (4 ounce) can mushrooms 2/3 cup milk 1 (8 ounce) package mozzarella cheese , shredded 1 teaspoon garlic salt[...]