Preheat oven to 425°. Spray 12 cup muffin tin with nonstick spray, set aside.
In a large mixing bowl, combine pumpkin, maple syrup, melted coconut oil, and egg. Once fully combined, mix in coconut sugar.
In a separate bowl, fully mix dry ingredients. Add dry ingredients to wet and mix just until combined, do not over mix.
To make the streusel, combine dry ingredients, then add butter in small pads. Using your fingers mix the butter into the dry ingredients until it resembles coarse meal. Add pecans, if using.
Spoon batter into prepared muffin tins until about 3/4 full. It should use the entire recipe to make 12.
Evenly spoon streusel on top of muffins.
Place on center rack of oven. Bake at 425° for 5 minutes. Then reduce the heat to 375° and bake for another 15-20 minutes until muffins are fully baked and tops spring back when touched.