- Begin by preheating your oven to 350 degrees Fahrenheit. Then, take a 6-mold donut pan and coat it with non-stick baking spray. Set the pan aside for later.

For the Crumb Topping:

- In a small bowl, mix together sugar, flour, and cinnamon. Add the cubes of butter and work them into the mixture swiftly until it resembles a coarse meal. Place the crumb topping in the freezer to chill while you prepare the donut batter.

For the Donuts:

- In a large bowl, whisk together the dry ingredients. In a separate bowl, whisk the wet ingredients. Gently fold the wet mixture into the dry mixture, being careful not to overmix.

- Spoon or use a piping bag to fill the prepared donut pan with the batter. Sprinkle the crumb topping evenly on top of each donut.

- Bake in the oven for about 10-11 minutes or until the donuts spring back when lightly pressed. Let the donuts cool in the pan for 10 minutes before gently removing them and transferring to a wire rack to cool for a few more minutes.