Prepare Preheat your oven to 350°F and prep your muffin pan well for nonstick. Muffin liners were used to make my muffins.
Spice Blend. In a small bowl, use a small whisk or fork to combine together the spices (cinnamon, ginger, nutmeg, and cloves).
Dry Ingredients. In a medium bowl, use a whisk to combine together the flour, baking powder, baking soda, and the spice blend you made in the second step.
Paste. Using another medium sized bowl, combine together the unsweetened cocoa powder, two tablespoons of the oat milk, and a tablespoon of the brown sugar. Use a fork or whisk to combine together these ingredients until a paste is formed. This will be used to make your muffin swirls.
Wet Ingredients. In a large mixing bowl, beat together the pumpkin puree, oil, and the remaining brown sugar until smooth. Then whisk in a half cup of the oat milk.
Combine. Add the dry ingredients from the medium bowl in the third step to the large mixing bowl. Mix these ingredients until just combined. A few lumps are okay as they will most likely bake out. Then take about a third of this batter and mix it into the chocolate paste.
Fill. To fill the muffin cups, start by using a large spoon to drop a dollop of pumpkin mixture into the bottom of each cup. Then top the pumpkin mixture with a dollop of the chocolate mixture. Continue to do this until the muffin cups are ⅔rds of the way full.
Swirl. Lastly, use a knife or toothpick to create the swirl effect in each of the muffins. Do this gently, avoiding mixing the colors together.
Bake. Bake your muffins for 20-25 minutes until the tops begin to brown and a toothpick inserted in the center comes out clean.
Cool. Let the muffins cool in the pan for 10 minutes before transferring to a cooling rack or serving.