Preheat oven to 400 degrees
Prepare 32 muffin tins with paper wrappers or cooking spray.
In large bowl - combine all dry ingredients except chocolate jimmies
In separate bowl- combine liquid ingredients & whisk until incorporated & egg yolks are broken.
Fold into dry ingredients - don't over mix but make sure you don't have any dry spots.
Spoon batter into prepared tins about 3/4 of the way full.
Sprinkle on additional chocolate chips & chocolate jimmies.
Bake 20-23 minutes or until toothpick test is clean.
Cool in tins about 10 minutes before moving to wire rack to continue cooling completely.
Store in airtight container at room temperature.