Preheat the oven to 350F and line 12 cupcake tins with paper liners (or spray them with nonstick baking spray).
Combine the flour, sugar, and baking powder in a large mixing bowl.
1 ½ cups all-purpose flour, 1 cup granulated sugar, 1 teaspoon baking powder
In another bowl, whisk together the vegetable oil, milk, eggs, and vanilla.
½ cup vegetable oil, ½ cup milk, 2 large eggs, 1 teaspoon pure vanilla extract
Add the wet ingredients to the dry and stir using a rubber spatula until well mixed (a few clumps are okay).
Add in ½ cup of the mini chocolate chip and stir until just combined.
1 cup mini chocolate chips
Fill each cupcake tin ⅔ full with batter-- I use a ¼ cup cookie scoop to ensure they’re all the same size.
Bake until the tops become a light brown color and a toothpick inserted into the center comes out clean-- about 14-16 minutes.
Transfer the cupcakes to a wire rack and let them cool to room temperature.
Once completely cooled, scoop out the center of each cupcake with a small ice cream scoop or paring knife and fill with mini chocolate chips-- about ½ teaspoon.
Add the scooped out piece of cake back on top of the chocolate chips and top with icing (below).