Easy Apple Crumble with Graham Crackers

Ingredients (13)

• For the Fruit:
• 4 to 5 cups cored, peeled, and diced apples,
• ¼ cup brown sugar
• 1 ½ tablespoons flour
• ¼ teaspoon kosher salt
• For the Topping:
• 1 sleeve (9 sheets) graham crackers,
• ¼ cup all-purpose flour
• 1 tablespoon brown sugar
• ½ teaspoon kosher salt
• 6 tablespoons butter,
• 1 teaspoon pure vanilla extract
• 16 to 20 jumbo marshmallows,