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I had to substitute the self rising flour with flour and baking powder instead. I posted the ingredients below as a note, please refer to Cookie Madness for the directions. With this recipe I was able to make 7 even to it's supposed to make 6.

3/4 cup plus 2 tablespoons self rising flour (I used 3/4 cup plus 2 tbsp all purpose flour with 1 1/3 tsp of baking powder, you should add a pinch of salt if your butter is unsalted)
3 tablespoons unsweetened natural cocoa powder
1/4 cup granulated sugar (generous or slightly heaping ¼ cup)* I just used 1/4 cup and it was fine*
5 tablespoons butter, melted and cooled
1 large egg (I used an extra large egg, even though it didn't look extra large to me)
3 oz evaporated milk (1/4 cup plus 2 tablespoons)*I used a bit less because I ran out*
1/2 teaspoon vanilla extract
1/2 cup semi-sweet chocolate chips (I used a 1/4 cup b/c my family doesn't like eating a lot of chocolate chips)

All the liquids mixed together.

All the dry ingredients.

Batter with chips.

In their separate cups.

Done!
My mom said that they tasted better than Costco's muffins! Well, her reason was that Costco's muffins were way to oily. But still, I thought the muffins tasted pretty good. They didn't take much effort and it was really easy to clean up the mess (wash dishes and such). So if you ever have any guests over for breakfast, make a batch of these muffins and they'll love it!