Preheat the oven to 325°F (163°C). Line two muffin pans with 20 paper or silicone liners. I used the parchment paper kind and they came out very easily.
Prepare the streusel. Mix the streusel ingredients in a small bowl until well combined. Set aside.
1/2 cup (69 grams) Bob's Red Mill Gluten-free 1-to-1 Baking Flour, 7 tablespoons (88 grams) brown sugar, 3 tablespoons + 1 teaspoon (47 grams) coconut oil, 2 teaspoons cinnamon, 1/8 teaspoon salt
Prepare the batter. In a large mixing bowl, mix together the dry ingredients (flour through salt).
2 cups (268 grams) Bob's Red Mill 1:1 Gluten-free Baking Flour, 1 1/2 teaspoons baking soda, 3/4 teaspoon baking powder, 4 teaspoons pumpkin pie spice, 1/2 teaspoon salt
In another large bowl, mix together the eggs, and then add the rest of the ingredients (sugars through pumpkin puree). Stir until combined.
2 large eggs, 1 cup (200 grams) brown sugar, 1/2 cup (100 grams) granulated sugar, 1/4 cup (60 ml) maple syrup, 3/4 cup (177 ml) oil, 15 ounces (425 grams) canned pumpkin puree
Add the dry mixture to the wet mixture and mix just until combined (do not over mix!).
Divide between the liners.
Top each with 1 tablespoon (20 grams) streusel.
Bake for 25 minutes or until a toothpick inserted in the side comes out clean. Remove from the oven and let the muffins cool in the pan for 5 minutes and then very carefully remove them to a wire rack to cool completely, about 1 hour. If you made them with olive oil, they may taste olive oily while still warm.
Store in an airtight container for up to 3-4 days or refrigerate for 5-6 days or freeze for a few months. Note that if you use coconut oil, they get quite firm in the fridge. Just a few seconds in the microwave turns them fluffy again!