Preheat the oven to 375ºF.
Line two 12-cup mini muffin pans with silicone cupcake liners or paper cupcake liners or spray with nonstick cooking spray. Set aside
In a large mixing bowl, whisk together flour, baking powder, and salt. Set aside.
2 ½ cups all-purpose flour, 1 tablespoon baking powder, 1 teaspoon salt
In a separate large bowl, mix together with a wooden spoon the vegetable oil, brown sugar, eggs, vanilla extract, milk and sour cream until well incorporated.
⅓ cup vegetable oil, 1 cup brown sugar, 2 large eggs, 2 teaspoons vanilla extract, ½ cup whole milk, ½ cup full-fat sour cream or plain Greek yogurt
Gently fold the dry ingredient mixture into the wet ingredients until no dry spots of flour are left.
Gently fold in mini chocolate chips.
1 ½ cups mini semi-sweet chocolate chips
Allow batter to rest for 20 minutes. This helps get a better rise out of the muffins. Skip this step if you are in a rush.
Using a small ice cream scoop, fill each cup of muffin tin to the top with muffin batter. Sprinkle tops with additional mini chocolate chips.
Bake in the preheated oven for 12 minutes, rotating the pan halfway through baking.
Allow to cool in muffin tins for 10 minutes, then transfer to a wire rack to cool completely.