Spray muffin pan with cooking spray or add foil muffin tins.
One - Whisk all of the dry ingredients together in a large bowl.
Two -Add the wet ingredients to the dry ingredients and then whisk together.
Three - Fold in the diced up apple.
.Four- Scoop the batter into a 12 cup muffin pan sprayed with cooking spray or use foil muffin cups
Five- Sprinkle the streusel topping on top of each muffin with a spoon
Six - Bake for 18 to 20 minutes baked in a 350 degree oven ( each oven varies)
Seven- Remove when done, tester comes out clean, cool, and add glaze
Baked in a 350 degree oven for 18 to 20 minutes ( my oven bakes on confectionery so they take a bit longer to bake because it bakes at 325 degree) or until a cake tester comes out clean
Let cool before adding glaze