Preheat the oven to 350°F (180°C) and prepare a muffin pan with liners. This will ensure easy removal of the muffins once they are baked.
In a large bowl, whisk together the dry ingredients: flour, sugar, cocoa powder, baking soda, salt, and chocolate chips. This will ensure that the dry ingredients are evenly distributed and combined.
2 cups All-purpose flour, 1 cup Granulated sugar, 1/2 cup Unsweetened cocoa powder, 1 and 1/2 teaspoons Baking soda, 1/4 teaspoon Salt, 1/2 cup Semi-sweet chocolate chips
In a separate bowl, whisk together the wet ingredients: eggs, sour cream or yogurt, oil, milk, and vanilla extract. This will create a smooth and creamy mixture.
2, large Eggs, 1 cup Sour cream or plain yogurt, 1/2 cup Vegetable oil, 1/2 cup Milk, 1 teaspoon Vanilla extract
Pour the wet ingredients into the bowl with the dry ingredients. Using a spatula or wooden spoon, gently fold the two together until just combined. Be careful not to overmix, as this can result in dense muffins.
Spoon the batter into the prepared muffin liners, filling them about three-quarters full. This allows room for the muffins to rise while baking.
Bake the muffins in the preheated oven for approximately 18-20 minutes, or until a toothpick inserted into the center comes out clean. This indicates that the muffins are fully cooked.
Remove the muffins from the oven and allow them to cool in the pan for a few minutes. Then, transfer them to a wire rack to cool completely before serving.