Next, in a large mixing bowl or stand mixer, add in flour, sugar, salt, and baking powder; and combine. Then continue with the oil, egg, and milk; and mix well. Lastly, mix in the strawberries.
Once done, fill cupcake liners that have been sprayed with non-stick cooking spray, up to the top, or simply place in a sprayed cupcake pan.
Next, combine all of the crumb ingredients in a bowl, and mix them together with a fork.
Sprinkle the crumb ingredients evenly over each muffin.
Bake 25-30 minutes or until the crumb topping has browned.