Preheat the oven to 350 degrees F. Line a muffin tin with paper liners.
Place the dry ingredients in a large bowl and whisk together.
Add the non-dairy milk, oil, and pumpkin puree. Mix by hand until combined.
In a small bowl, combine the ⅓ cup flour, brown sugar, and cold vegan buttery spread. Use a pastry cutter to mix until the mixture turns into coarse crumbs with some larger butter lumps.
Fill the muffin cups ⅔ full with batter. Sprinkle the streusel on top of each muffin.
Bake at 350 degrees F for 18-22 minutes. Makes 12 muffins.
Notes
Store leftover muffins in a ziploc bag or airtight container. They should stay fresh for about 4 days.You can freeze the leftover muffins if you wish - just wrap them well and store in a freezer safe bag. They should stay fresh for about 3 months.