Weigh out the ingredients
You'll need flour, baking soda, baking powder, brown sugar, sugar, spices, butter, applesauce, oil, yogurt, milk, eggs, oats, and apples.
Make the cake batter
Make the cake batter, then gently fold in the thinly sliced apple pieces.
Assemble the cake by spreading half of the batter into the pan, then topping with the cinnamon sugar swirl filling.
Assemble the cake
Add the rest of the cake batter, then top with the streusel. Bake for about 1 hour.
Allow the cake to cool in the pan completely, the drizzle the glaze on top and cut into 16 squares.
Cool & Glaze
Enjoy this apple streusel coffee cake with your morning coffee!