The process of making Brownie Muffins is fun and simple. Follow these steps for delicious results:

1. Preheat Oven: Begin by preheating your oven to 350°F (175°C). Line a muffin tin with paper liners or grease them lightly.

2. Mix Dry Ingredients: In a large bowl, whisk together the flour, cocoa powder, baking powder, and salt.

3. Combine Wet Ingredients: In another bowl, whisk the eggs and sugar together until well combined. Add the vegetable oil and vanilla extract, mixing thoroughly.

4. Combine Mixtures: Gradually add the dry ingredients to the wet ingredients, stirring until just combined. Be careful not to overmix, as this can lead to dense muffins.

5. Add Chocolate Chips: Fold in the semi-sweet chocolate chips, which enhance the chocolate flavor and provide delightful melty pockets.

6. Fill Muffin Tin: Spoon the batter evenly into the prepared muffin tin, filling each cup about ⅔ full.

7. Bake: Place in the preheated oven and bake for 18-20 minutes, or until a toothpick inserted into the center comes out with a few moist crumbs (not wet batter).

8. Cool: Remove from the oven and allow them to cool in the pan for about 5-10 minutes. Transfer the muffins to a wire rack to cool completely.