Pizza Casserole

3 pounds ground beef
1/2 cup chopped onion
1 jar (28 ounces) spaghetti sauce
2 jars (4-1/2 ounces each) sliced mushrooms, drained
1 teaspoon salt
1/2 teaspoon garlic powder
1/2 teaspoon dried oregano
Dash pepper
1 package (16 ounces) wide egg noodles, cooked and drained
2 packages (3-1/2 ounces each) sliced pepperoni
2 cups (8 ounces) shredded cheddar cheese
2 cups (8 ounces) shredded part-skim mozzarella cheese

In a Dutch oven, brown beef and onion over medium heat until meat is no longer pink; drain. Add spaghetti sauce, mushrooms, salt, garlic powder, oregano and pepper; heat through.

Spoon 4 cups into a 6-qt. slow cooker. Top with half of the noodles, pepperoni and cheeses. Repeat layers. Cover and cook on high for 1 hour or until cheese is melted. Makes 12 servings.