Preheat the oven to 325 and lightly spray two 9×5 loaf pans with non-stick spray. Set aside.
Peel your apples and dice into small pieces.
In a medium bowl, add the flour, cinnamon, nutmeg, baking soda, and salt and whisk together.
In another large bowl, add the applesauce (or vegetable oil), eggs, sugars, and vanilla and mix with a whisk until fully combined.
Pour the dry ingredients into the wet ingredients in batches (I did three parts) and stir with a spatula until fully combined. The batter will be very thick.
Stir in the diced apples.
Pour half of the batter into each prepared loaf pan – try to keep the amounts even.
To make the streusel
In a small bowl, add the softened butter, cinnamon, and sugar and mix together with a fork. Drop the streusel mixture onto the tops of the batter and lightly swirl.
Bake for 1 hour then check on your loaves. Insert a toothpick into the center – if it comes out clean, with moist crumbs, your bread is done.
Let cool in the pan for about 10 minutes then lightly run a knife around the edges to loosen. Flip onto a plate, slice and enjoy!