1 pound spaghetti 1 pound lean ground beef 1/4 teaspoon salt 1/4 teaspoon ground black pepper garlic powder to taste 1/2 cup chopped green bell pepper | 1 (26 ounce) jar pasta sauce 3/4 cup sour cream 1/2 cup chopped green onions 1/2 (8 ounce) package cream cheese 1 1/2 cups shredded Cheddar cheese |