For the cake, you'll need flour, baking powder, baking soda, spices, milk, yogurt, applesauce, oil, butter, sugars, eggs, vanilla, and honeycrisp apples.
Make the batter
Cream the butter and sugars together, then mix in the eggs and vanilla. Alternate adding the dry and wet ingredients. Then, fold in the honeycrisp apples.
Make the cinnamon swirl
Combine cold butter, brown sugar, and cinnamon.
Make the streusel
Combine the oats, sugars, spices, and cold butter.
Pour half of the cake batter into the square pan, then add the cinnamon swirl. Add the rest of the batter and top with the streusel. Bake at 350 degrees F for about 1 hour.
Top with glaze & enjoy!
Once cool, top with a simple glaze and enjoy!