Preheat your oven to 350°F (175°C). Peel, core, and slice the apples into ¼-inch wedges. Combine apples with sugar and 1 tsp of cinnamon; toss until coated. Spread the apple mixture in a greased 9×13 baking dish.

In a separate bowl, whisk together flour, 1½ cups sugar, baking powder, 1 tsp cinnamon, and salt until blended. Add the beaten eggs and melted butter, mixing until crumbly.

Sprinkle the topping evenly over the apple mixture without pressing it down. Drizzle the remaining melted butter over the topping.

Bake for 45-55 minutes until the topping is golden brown and the edges bubble. Allow to cool for 10 minutes before serving.