Preheat oven to 375 degrees F. Lightly grease either an 8x8 or 9x9 baking dish and set aside (you could also line with parchment paper for easy clean-up).
In a large bowl, whisk the milk, maple syrup, eggs, vanilla, and coconut oil.
1 ¾ cups milk of choice, ¼ cup pure maple syrup, 2 eggs, 1 tsp. pure vanilla extract, ¼ cup melted coconut oil
Add the remaining ingredients (rolled oats, baking powder, salt, cacao powder, and ground flaxseeds) to the bowl and then fully mix until ingredients are combined.
2 ½ cups rolled oats, 2 tsp. baking powder, ½ tsp. fine sea salt, ⅓ cup ground flaxseeds, ⅓ cup cacao powder
Pour oat mixture evenly into the prepared baking dish. Sprinkle with chocolate chips if desired.
¼ cup chocolate chips
Bake for 35-40 minutes, or until middle of oats have just set. If using a 9x9 pan, be sure to check between 30-35 minutes.
Allow to slightly cool. Slice and enjoy!