Preheat oven to 350 degrees F and lightly grease an 8x8-inch (or similar size pan) baking dish with oil.
To a large mixing bowl, add avocado oil, coconut sugar, maple syrup (optional), vanilla extract, and peppermint extract. Whisk thoroughly to combine and dissolve the coconut sugar.
Add in the eggs and milk and continue to whisk.
In a separate bowl, add flour, baking powder, baking soda, sea salt, and cocoa powder. Create a crater in the center of the flour mixture and pour in the liquid. Mix thoroughly before adding the chocolate chips.
Evenly spread the batter into the prepared baking dish. Add a few pinches of flake salt to the top to accentuate the chocolate flavor and add a surprise crunch (optional).
Bake for 17-22 minutes, or until the edges of the brownies appear baked and the center is no longer wet.
Remove from oven and let cool in the pan for about 10 minutes.
Serve warm and gooey, or allow to cool! Top with whipped cream and peppermint candy if desired.