Preheat oven to 350 and grease a 9"x13" baking dish.
In a large bowl, whisk together the oats, baking powder, and chia seeds.
3 cups rolled oats, 1 teaspoon baking powder, 2 tablespoons chia seeds
Stir in the milk, eggs, peanut butter, maple syrup, and vanilla, and then fold in the chocolate chips.
2 cups milk, 4 eggs, 1/2 cup peanut butter, 1/3 cup maple syrup, 1 teaspoon vanilla, 2/3 cup dark chocolate chips
Pour into the baking dish and bake for 30-35 minutes, using a spoon to swirl the chocolate chips after 15 minutes. Enjoy!