Preheat oven to 350° F. and spray a 12-cup muffin pan with cooking spray or add muffin liners to it.
In a large bowl whisk together the dry ingredients. In a smaller bowl whisk together the wet ingredients. Pour the wet in with the dry and stir them together with a rubber spatula until you no longer see streaks of flour. Don't over-mix.
Stir the pepitas into the batter and then divide it evenly into the muffin pan. Place on the middle rack of the oven and bake for 15-20 minutes or until a toothpick inserted in the center of a muffin comes out clean or with a few crumbs attached.
Let the muffins cool in the pan for 5-10 minutes before removing them onto a wire cooling rack.
Notes
The muffins will keep for up to 3 days at room temperature in an airtight container. You can also freeze them for up to 3 months.