Apple-Pie Baked Oats

Preheat oven to 375°F. Coat a 9-by-13-inch baking dish with cooking spray. Melt butter in a 10-inch skillet over medium-low heat. Add sliced apples and cook, stirring, until well coated, 1 to 2 minutes. Add cinnamon; cook, stirring, until the cinnamon is toasted and fragrant, 1 to 2 minutes. Add brown sugar; cook, stirring frequently, until the apples are soft, 3 to 5 minutes.

Whisk milk and eggs in a large bowl. Stir in oats, protein powder, chia seeds and baking powder. Add the apple mixture and stir to combine.

Transfer the batter to the prepared baking dish, spreading it evenly. Bake until golden brown on the edges, 30 to 35 minutes. Place the pan on a wire rack to cool slightly, about 10 minutes, before cutting into 6 slices. Top each serving with a dollop of yogurt and/or a drizzle of maple syrup, if desired.