Preheat the oven to 350℉. Line a 12-cavity muffin pan with paper liners. Set aside for later.
In a small mixing bowl, whisk together the milk, egg, sugar, oil, and vanilla extract until combined. Set aside.
1 cup whole milk, 1 large egg, 3/4 cup granulated sugar, 1/4 cup vegetable oil or canola oil, 2 teaspoons vanilla extract
In a larger mixing bowl, whisk together the flour, chocolate chips, baking powder, and salt until combined.
2 cups all-purpose flour, 1½ cups chocolate chips, 1 tablespoon baking powder, ½ teaspoon salt
Pour the wet ingredients into the dry ingredients and gently mix together, using a silicone spatula, just until combined and no flour streaks remain.
Evenly divide the muffin batter between the 12 muffin cups. Each cup will be almost full.
Bake for 23-28 minutes or until the muffin tops are golden brown and domed shaped. * More helpful ways to know if they're done is to insert a toothpick into the center making sure it comes out clean, or gently touch the muffin and it should bounce back. * All ovens are so different, and it can vary depending on what size muffin pan is used, which is why the bake time varies above. Set the time for the minimum and watch the muffins from there. * For mini muffins bake for 10-12 minutes. Let the muffins cool in the pan for about 10 minutes before removing them to a cooling rack. Enjoy!