Prep: Preheat oven to 375°F. Lightly grease an 8-inch square baking dish.
Mix Fruit: Toss the apples with the lemon juice, brown sugar, 3 tbsp flour, and spices. Spread evenly into the dish.
Make Dough: Whisk 3/4 cup flour, 2 tbsp sugar, baking powder, and salt. Cut in the cold butter until it looks like crumbs. Stir in buttermilk until just combined.
Assemble: Drop spoonfuls of dough over the apples. Sprinkle the remaining 2 tbsp sugar over the top.
Bake: Bake for 35–45 minutes until the topping is golden and the fruit juices are bubbling.