Preheat the oven to 350℉. Line a muffin tin with cupcake liners and spray with nonstick spray.
In a large bowl, whisk together the vegetable oil and sugars. Add the egg, vanilla, pumpkin puree, and sourdough starter discard. Continue mixing until smooth.
½ c vegetable oil, ½ c brown sugar, ½ c granulated sugar, 3 eggs, 1 tablespoon vanilla extract, 1 15 oz can pumpkin puree, ¾ c sourdough discard
In a medium bowl, mix together the flour, cinnamon, pumpkin pie spice, baking powder, baking soda, and salt.
2 c all-purpose flour, 1 teaspoon cinnamon, 1 teaspoon pumpkin pie spice, 2 teaspoon baking powder, 1 teaspoon baking soda, ¼ teaspoon salt
Add the dry ingredients to the wet ingredients and continue to whisk until smooth and free of lumps.
Fill the muffin tins about ¾ full then top with the cinnamon streusel mixture.
Bake in the preheated oven for approximately 20 minutes or until a toothpick inserted in the center comes out clean.
Allow the muffins to cool slightly before topping them with the maple glaze.