Step 1Heat the oven to 375 degrees. Butter a 13-by-9-inch baking dish.
Step 2Prepare the filling: In a large bowl, whisk together three-fourths cup sugar, 2 tablespoons flour, the allspice, cinnamon and nutmeg. Toss in the cubed apples to coat with the mixture. Sprinkle over the water and mix to combine. Turn the mixture out onto the greased baking dish.
Step 3For the cobbler topping, in a large bowl, whisk together 2 cups flour, the baking powder, salt and orange zest. Add one-third cup butter cubes and, using your fingertips, mash the butter into the dry ingredients until the mixture comes together in a sand-like texture. Pour over the milk and stir just to combine. Drop spoonfuls of the cobbler topping over the apple filling. Don't worry about completely covering the apple mix, as the batter will spread out during cooking.
Step 4Make the crumble topping: In a large bowl, whisk together the remaining 1 cup flour, one-half cup sugar and one-half cup brown sugar. Add the remaining one-half cup butter cubes and mix them into the dry ingredients with your fingertips as before. Add the oats and mix until combined but still crumbly. Sprinkle the topping over the apple and cobbler mix.
Step 5Bake the cobbler crumble until the top is lightly browned, the cobbler is baked through (a cake tester or knife inserted should come out clean) and the apples are bubbly, 35 to 40 minutes. Remove from heat and cool slightly before serving. Serve topped with creme fraiche, vanilla ice cream or sweet cream.