Mill the wheat berries for both the bread and the topping at the same time. Preheat the oven to 350°F and grease a 9x5 loaf pan.
250 g soft white wheat berries, 10 g soft white wheat berries, 30 g soft white wheat berries
In a large mixing bowl, whisk together the applesauce, maple syrup, eggs, and vanilla until well combined.
1 cup unsweetened applesauce, ½ cup maple syrup, 2 eggs, 2 tsp vanilla extract
Add the fresh milled flour, cinnamon, nutmeg, baking soda, baking powder, and salt right on top of the wet ingredients, and gently whisk until no flour is showing. Pour in the melted butter and stir until just incorporated.
1 tsp ground cinnamon, ½ tsp ground nutmeg, ½ tsp salt, 1 tsp baking soda, ½ tsp baking powder, ¼ cup butter, 250 g soft white wheat berries
Set the batter aside to rest while you prepare the topping. Dice the apple small and toss it with a little of the topping flour and some of the cinnamon so the pieces stay on top of the loaf instead of sinking into the batter.
1 small apple, 10 g soft white wheat berries, ½ tsp ground cinnamon
In a separate bowl, combine the rest of the topping flour with the remaining cinnamon, brown sugar, and oats. Add the cold diced butter and work it in with your fingers until no chunks of butter remain.
¼ cup rolled oats, ⅓ cup brown sugar, 2 tsp ground cinnamon, 1 pinch salt, 2 tbsp cold butter, 30 g soft white wheat berries
Pour half of the batter into the prepared loaf pan and sprinkle about a third of the crumb mixture over it. Spread the rest of the batter evenly on top, being careful not to mix the crumb layer into it. Scatter the diced apples over the top in one thin layer that barely covers the batter, then sprinkle on the rest of the crumb mixture.
Bake in the preheated oven for about 1 hour. If the top is getting too dark, loosely tent the loaf with foil just before the hour mark.