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.
Please note that the nutrition data given here is a ballpark figure. Exact data is not possible.