Preheat oven to 350°F. If not using muffin cups, grease your muffin tin; otherwise, distribute cups.
In a mixing bowl, mix together the flour, baking powder, and salt.
In a second bowl, mix together the sugars, melted butter, and vanilla extract.
Add one egg at a time to the sugar mix, stirring to make sure it's fully incorporated before adding the next.
Add about ⅓ of the flour mixture to the sugar mix and stir until just combined. Repeat with the second third, then the third.
Divide the batter in half between the bowls.
In one bowl, stir in the chocolate chips, cocoa powder, and espresso powder. Reserve some chocolate chips to top.
In the other bowl, stir in the pumpkin puree, pecans, cinnamon, nutmeg, and cloves. Reserve some pecans to top.
Spoon alternating spoonfuls of batter into the muffin cups. Use a toothpick to lightly swirl the two together. Top each filled cup with a few chocolate chips and pecans.
Bake for 25 minutes, or until slightly after a toothpick comes out clean.
Remove from the oven and let cool at least 10 minutes before moving to a cooling rack.
Enjoy!