Preheat your oven to 350F and add liners to each cavity of your muffin tin.
Add the vinegar to the milk, stir, and let it sit for at least 5 minutes. You will notice it begin to curdle - this is a good sign! We're trying to mimic buttermilk.
1 cup milk, 1.5 tbsp white vinegar
In a large bowl, whisk together the dry ingredients.
2 cups AP flour or gluten free 1-to-1 flour, ¾ cup cane sugar, ¼ cup beetroot powder, 3 tbsp natural cocoa powder, 1 tsp baking powder, ½ tsp baking soda, ½ tsp kosher salt
In another large bowl, whisk together the wet ingredients until smooth.
2 large eggs, ½ cup avocado oil, 1 cup milk, 1.5 tbsp white vinegar, 1 tsp vanilla extract
Add the wet ingredients to the dry ingredients and stir with a spatula until just incorporated. A little bit of flour should still be visible at this point.
If using, add in the white chocolate chips and stir until no more flour is visible. Don't overmix!
1 cup white chocolate chips
Pour or scoop out batter into the prepared muffin tin. Each should be filled ¾ of the way. Optionally, top with a few extra white chocolate chips.
Transfer to the oven and bake for 20 minutes, or until a tester comes out clean.
Let cool before removing from the pan. Enjoy!