1-First Step: Preheat your oven to 375°F. Note that if you’re using dark coated muffin pans, you’ll want to reduce the temperature to 350°F to prevent overbaking. While the oven heats, prepare a 12-cup muffin tin by lining it with paper liners or generously greasing the cups. Having everything ready before you start mixing will make the process so much smoother.

2-Second Step: In a large mixing bowl, whisk together the 1 ¾ cups all-purpose flour, 1 cup granulated sugar, ⅔ cup unsweetened cocoa powder, 2 teaspoons baking powder, ½ teaspoon baking soda, and ½ teaspoon salt. Whisking thoroughly ensures that the leavening agents are evenly distributed throughout the flour, which is key for uniform rising. Once these ingredients are well combined, toss in 1 ½ cups of the semisweet chocolate chunks, coating them lightly with the flour mixture. This simple trick helps prevent the chocolate from sinking to the bottom of your muffins during baking.

3-Third Step: Grab another bowl (I like to use a large measuring cup to save on dishes) and whisk together 2 large eggs, 1 ½ cups buttermilk (or your prepared substitute), 1 teaspoon vanilla extract, and ½ cup vegetable oil (or your chosen oil alternative). Whisk until the mixture is smooth and well combined. The buttermilk adds wonderful tenderness to the crumb while providing a subtle tang that perfectly balances the chocolate’s richness.

4-Fourth Step: Pour your wet ingredients into the dry ingredients. Using a spatula or wooden spoon, gently stir until just combined. This is crucial overmixing will develop too much gluten and result in tough muffins rather than tender ones. The batter will be thick and slightly lumpy, which is exactly what you want. Some streaks of flour are okay; they’ll disappear during baking. The most important thing is to stop mixing as soon as you no longer see dry flour.

5-Fifth Step: Divide the batter evenly among your prepared muffin cups, filling each about three-quarters full. An ice cream scoop makes this task incredibly easy and ensures uniform muffin size. Once all the cups are filled, sprinkle the remaining ½ cup chocolate chunks over the tops of the batter. These extra chunks will bake beautifully on top, creating those irresistible pools of chocolate that make these fudgy chocolate chunk muffins so special.

6-Sixth Step: Place the muffin tin in your preheated oven and bake for 15-17 minutes. You’ll know they’re done when the tops spring back lightly when touched gently. Avoid overbaking checking a few minutes early is always better than drying out your muffins. The centers should be set but still moist, not dry or cakey. If you’re unsure, you can insert a toothpick into the center of a muffin; it should come out with moist crumbs rather than wet batter or completely clean.

7-Final Step: Once baked, transfer the muffin tin to a wire rack and let the muffins cool for about 5 minutes in the pan. This brief resting period allows them to firm up slightly for easier removal. After 5 minutes, carefully transfer each muffin to the wire rack to cool completely. This prevents them from becoming soggy as steam releases. While these chocolate chunk muffins are absolutely divine warm from the oven, letting them cool completely ensures the best texture and makes them easier to handle. If you have the willpower, they actually develop even more flavor after resting for a few hours!