Rainier Cherry and Chocolate Baked Oatmeal

Ingredients

• 1 cup fresh Rainier cherries, rinsed with stems and pits removed
• 1 medium ripe banana
• 1 cup steel-cut oats
• 1/2 cup chopped walnuts
• 1/3 cup packed brown sugar
• 3 tbsp mini semi-sweet chocolate chips
• 1 tsp baking powder
• 1/2 tsp salt
• 1 1/2 cups fat-free milk
• 1 egg
• 2 tbsp melted butter, slightly cooled