Sausage Polenta

Ingredients

• 1/2 c. finely chopped onion
• 1 clove garlic, minced
• 2 Tbsp. salad oil
• 1 (1 lb.) can tomatoes (2 c.)
• 1 (6 oz.) can tomato paste (2/3 c.)
• 1 (3 oz.) can broiled sliced mushrooms with liquid (2/3 c.)
• salt and pepper
• 1/2 tsp. oregano
• 1/2 c. grated Parmesan cheese
• 1 box corn muffin mix
• 1 (8 oz.) pkg. Brown 'N Serve sausage
• 1/2 c. shredded sharp process cheese