Spinach-Stuffed Shells

Ingredients

• 1 small onion, diced
• 2 (14 1/2 oz.) cans whole tomatoes (undrained)
• 1 (6 oz.) can tomato paste
• 1 (8 oz.) can tomato sauce
• 2 tsp. brown sugar
• 1/2 tsp. salt
• 1/4 tsp. pepper
• 1 tsp. dried whole oregano
• 24 jumbo shells
• 2 (10 oz.) pkg. frozen chopped spinach, thawed and drained
• 1 (16 oz.) cottage cheese
• 1 c. Mozzarella
• 1/4 tsp. pepper