Preheat the oven to 350° F. Spray an 8x8 baking pan with non stick spray, or line with parchment paper and set aside.
In a large bowl, whisk together the oats, cocoa powder, baking powder, and salt.
Pour in the milk, maple syrup, eggs, oil, and vanilla. Mix until everything is combined and smooth.
Fold in the chocolate chips with a rubber spatula. Pour the oat mixture into the baking pan and top with extra chocolate chips.
Bake for 30-40 minutes, or until the center is set. Allow the oats to cool in the pan for a few minutes before serving.
Melt extra chocolate chips or chopped chocolate and drizzle on top of oats, finishing with flaky sea salt.
