Mac and Chicken Burger Casserole

Ingredients

• 1 lb lean ground chicken
• 1 tsp olive oil
• 1 cup onion(s), diced
• 1 clove garlic, minced
• 1/2 lb mushrooms, sliced
• 1/2 cup celery, chopped
• 1 cup red pepper(s), diced
• 1 cup yellow pepper(s), diced
• 1 cup peas, frozen
• 1 tbsp gluten free Worcestershire sauce
• 1 tsp oregano, dried
• 1 1/2 cup 1% milk
• 1/2 tsp salt
• 1 tbsp cornstarch, gluten free
• 2 tsp cornstarch, gluten free
• 1/2 tsp mustard powder
• 1/8 tsp nutmeg, ground
• 1 can canned diced tomatoes
• 1 tsp paprika
• 2 cups brown rice macaroni
• 1 cup swiss Emmental cheese, grated
• 3 tbsp Romano cheese, grated
• cooking oil spray