Preheat oven and grease pan:
Set oven to 350°F (175°C). Mist a donut pan with non-stick spray.Mix dry ingredients:
In a medium bowl, combine flour, baking powder, and sugar with a whisk.Add wet ingredients:
Beat in eggs, milk, vanilla, and oil until just incorporated.Fold in chocolate chips:
Gently fold in mini chocolate chips until they're evenly spread.Fill donut cavities:
Spoon batter into each donut cavity until about 7/8 full.Bake and cool:
Bake 12-13 minutes, until golden and a toothpick comes out clean. Let cool in pan briefly, then move to a wire rack. Serve warm or at room temperature.