Preheat oven to 350°F. Line a muffin pan with 12 liners.
In a medium bowl, combine streusel ingredients. When fully combined, transfer to a baking sheet to break up chunks into no larger than pea size.
In a large bowl or stand mixer, cream together butter and sugars. Mix in egg, vanilla and pumpkin until smooth. Finally add remaining dry ingredients, mixing until no streaks remain. Immediately divide between prepared liners using a large cookie scoop. Sprinkle well with streusel mixture.
Bake at 350°F for 20-25 minutes. Cool completely in pan.
Meanwhile, beat together powdered sugar and milk. Drizzle over cooled muffins.
Enjoy immediately or store in an airtight container.
Nutritional information is provided as a courtesy and is an estimate only. Nutrition information can vary for a variety of reasons. For the most accurate data, use your preferred nutrition calculator with the actual ingredients you used to make this recipe.
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