World's Best Apple Crisp | Lazy Cooking

Ingredients

• 10 cups apples, peeled and cored, sliced
• 1 cup white sugar
• 1 cup plus 1 tablespoon all-purpose flour, divided
• 1 teaspoon ground cinnamon
• 3 tablespoons water
• 1 cup quick-cooking oats
• 1 cup brown sugar, packed
• 1/4 teaspoon baking powder
• 1/4 teaspoon baking soda
• 1/2 cup butter, melted
• vanilla ice cream, optional, to taste, for serving