In a large mixing bowl, combine all the dry ingredients with a whisk.
Add the wet ingredients.
Whisk or stir well to thoroughly combine.
Line a standard muffin pan with cupcake papers. I used paper liners here, but foil works much better at releasing from the finished muffins. I highly recommend that over paper for this recipe. Silicone liners are also a better option and probably the best option of all three.
Fill the liners 3/4 of the way full. I used a cookie dough scoop to make sure they were all uniform.
In a separate, small mixing bowl, add all the streusel ingredients and mix well.
Top each muffin with approximately 1 tablespoon of streusel per muffin.
Bake at 350 F. for 40-45 minutes, making sure to cover them loosely with foil in the last 15 minutes of baking to avoid burning the tops.
Video
Notes
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.