Preheat your oven to a toasty 425°F (218°C). Next, spray your muffin pan with nonstick spray or light butter, or add cute cupcake liners. You will make 14 muffins; either spray another pan or prepare yourself for leftover batter.
Mix the flour, baking soda, cocoa powder, sugar, salt, and semisweet chocolate chips in a large bowl and set aside.
In another bowl, crack those eggs and whisk them up with the oil, milk, sour cream, and vanilla until combined. Then, pour that into our dry ingredients (from Step 2) and gently fold everything in. Don't go too crazy with the mixing.
Fill those liners (about ¾ full) with your batter. Then, pop them in the oven for a quick 5-minute blast at 425°F before dialing it down to 350°F.
Let them bake for 15 to 17 minutes until a small toothpick poked in the middle comes out mostly clean. (20 to 22 minutes of total baking time, or 15 minutes at 350°F if you make mini muffins).
Let them sit in the pan for 10 minutes before transferring them to a wire rack to finish cooling. Enjoy!