DO NOT OVERMIX
Combine the milk and vinegar in a measuring cup and let sit for 5-10 minutes.
Preheat oven to 425ºF. Grease a 6 cup, jumbo muffin tin with non-stick cooking spray.
In a large bowl, mix together the dry ingredients: flour, baking powder, baking soda, salt, cinnamon, and sugars.
Then add the butter, oil, eggs, vanilla, and the milk + vinegar mixture and stir. Remember, don't over mix. It's ok if there are a few lumps!
Fold in the chocolate chips.
Fill each cup in the muffin tin to be almost completely full, about 1/2 cup. Sprinkle with sparkling sugar, if using.
For jumbo: bake at 425ºF for 5 minutes.
After 5 minutes, decrease the heat to 375ºF and bake for another 15 minutes, or until the center has cooked completely. Remove from oven and let cool for a few minutes before removing from the tin and serving.
For regular: bake at 425ºF for 5 minutes.
After 5 minutes, decrease the heat to 375ºF and bake for another 8 minutes. Remove from oven and let cool for a few minutes before removing from the tin and serving.
Makes about 8 jumbo muffins (1/2 cup batter in each tin) OR 6 jumbo and 6 regular muffins.*
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