Follow these simple steps to whip up your Sour Cream Double Chocolate Muffins:

1. Preheat the Oven: Preheat your oven to 350°F (175°C). Line a standard muffin tin with paper liners or grease it lightly.
2. Mix Dry Ingredients: In a large bowl, whisk together the flour, sugar, cocoa powder, baking soda, baking powder, and salt.
3. Combine Wet Ingredients: In another bowl, beat the eggs, then add the sour cream, vegetable oil, and vanilla extract. Mix until smooth and well combined.
4. Combine Mixtures: Gradually add the wet ingredients to the dry ingredients, stirring gently until just combined. Be careful not to overmix.
5. Add Chocolate Chips: Fold in the semi-sweet chocolate chips, ensuring they are evenly distributed throughout the batter.
6. Fill Muffin Tin: Spoon the batter into the prepared muffin tin, filling each cup about ¾ full.
7. Bake: Place in the preheated oven and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
8. Cool: Once baked, remove the muffins from the oven and let them cool in the pan for about 10 minutes. Then, transfer them to a wire rack to cool completely.

These straightforward steps will guide you in creating the most incredible Sour Cream Double Chocolate Muffins.