INGREDIENTS
butter, for greasing pan or baking spray
2 cups
rolled oats (long cooking) or steel-cut oats
1/4 cup
brown sugar
1 tsp
cinnamon
1 tsp
baking powder
1/2 tsp
sea or kosher salt
2 cups
milk
1/2 cup
creamy peanut butter
1 cup
apple, peeled and diced small
2 tbsp
chopped walnuts