Preheat oven: Preheat oven to 425°F.
Bake sweet potato: Pierce sweet potato with a fork in 2-3 spots. Wrap in foil and roast until tender, about 30 minutes. Let cool. Peel sweet potato and mash with a fork. Measure out 1 cup of mashed sweet potato for the recipe and save the rest for something else.
Make flax eggs: Add ground flax to water and whisk together in a small bowl. Set aside for 5 minutes to thicken.
Lower oven temp: Lower oven temp to 350ºF. Lightly coat a mini muffin tin with coconut oil.
Combine wet ingredients: Add mashed sweet potato, maple syrup, coconut oil, flax eggs and vanilla into a large bowl and stir to combine.
Add wet ingredients: Add flour, cocoa powder, baking powder and salt. Stir to combine. Gently stir in chocolate chips.
Bake: Drop batter into the wells of your greased mini muffin tin and bake for 20 minutes. Brownie bites are done when you can insert a knife and it comes out clean.