• Prepare by greasing your donut pans lightly with a non-stick cooking spray or other method of your choice; preheat your oven to 350℉.

Make the Crumb Topping

• Mix together the sugars, cinnamon, and flour together in a medium bowl. Add the melted butter and stir to combine until it's crumbly and the texture you prefer.

Make the Donuts

• In a mixing bowl, combine the flour, baking powder, baking soda, cinnamon, and pie spice. Give this a whisk and set it aside.
• In another bowl, whisk together the melted butter, brown sugar, sour cream, vanilla, eggs, and milk, until fully combined.
• Add the wet mix into the dry mix and stir to combine. Be careful not to over-mix or you'll end up with denser, heavier donuts.
• Spoon or pipe this mixture into your donut tins, filling each about halfway to allow for rising as they bake.
• Before baking, take about 3 Tbsp of the crumb topping and spread it over the top of the donut batter. Press it lightly into the batter so it sticks and doesn't just fall off.
• Bake for about 12 minutes.
• Let the donuts cool slightly, about 2-3 minutes. Then extract them and put them on a cooling rack to finish cooling (or enjoy right away.) If they stick slightly, I find a toothpick helps loosen them up.