This Gluten-Free Apple Crisp is everything I love about fall desserts: warm, saucy apples; a thick, crunchy cinnamon-oat topping; and edges that caramelize beautifully thanks to the cast iron skillet. We bake this in a 10-inch cast iron, which gives the apples more surface area to soften evenly while keeping the topping perfectly crisp instead of soggy.

This crisp tastes like a classic fall dessert that just happens to be gluten-free, with zero compromise on texture. If you're getting into the autumn baking mood, pair this dessert with a cozy breakfast like my Maple Pumpkin Muffins or a warm drink alongside my High-Protein Espresso Loaf Cake.

Why You'll Love This Fall Dessert

We designed this recipe to guarantee success, focusing on flavor and perfect structure.

• Gluten-Free, Never Gritty: By combining certified gluten-free oats and the right GF flour, we achieve a thick, crunchy oat topping that stays crisp overnight, completely avoiding the common “good for gluten-free” texture.
• Deep Caramel Flavor: The strategic use of dark brown sugar (in both the filling and the topping) plus the high heat of the cast iron creates a deep, molasses-rich caramel sauce around the apples.
• Superior Texture: The apples stay soft but hold their shape (not mushy), and the topping is thick, crunchy, and golden brown all the way to the edges.
• Simple & Straightforward: No special techniques, complicated pie crusts, or extra steps—just mix, assemble, and bake.

Essential Equipment: For the Ultimate Crisp

Achieving that deeply caramelized, crunchy-yet-tender texture requires specific tools. We recommend investing in these two items for consistently perfect results:

10-Inch Cast Iron Skillet: This is the star of the recipe. Cast iron heats incredibly evenly, promoting deep caramelization around the apple edges that you simply cannot get from glass or ceramic. It helps the topping stay crunchy because it releases moisture efficiently, and it keeps the entire crisp warm for serving.

Ingredients Focus: Depth and Structure

Certified Oats: Oats are what make this a “crisp.” Use certified gluten-free oats so everyone at the table can safely enjoy this dessert.

Apples: Use a mix of tart and sweet baking apples (Granny Smith plus Honeycrisp or Fuji) so the filling has balance and depth. They should hold their shape, not dissolve.

Gluten-Free Flour: A basic 1:1 gluten-free all-purpose blend with xanthan gum works here. It helps lightly thicken the filling and gives the topping structure. (If your blend doesn't contain xanthan, add a tiny pinch to the topping mix.)

Dark Brown Sugar: The extra molasses in the dark brown sugar is a game-changer, providing a much deeper, complex flavor than light brown sugar.

How to Make Gluten-Free Apple Crisp

1. Preheat the Oven & Prep

Preheat your oven to 350°F (177°C). Lightly grease your 10-inch cast iron skillet with butter or oil.

2. Make the Apple Filling

In a large bowl, combine the chopped Granny Smith apples, dark brown sugar, GF flour, cinnamon, salt, vanilla extract, and lemon juice. Toss until every piece of apple is evenly coated and the mixture looks glossy. (There should be no dry flour visible—it will dissolve into a sauce as it bakes.)

3. Make the Topping

In a separate medium bowl, whisk together the oats, dark brown sugar, GF flour, cinnamon, and salt. Add the cold cubed butter. Use your hands or a pastry cutter to cut the butter into the dry ingredients until the mixture forms coarse crumbs with some larger, uneven clumps.

4. Assemble & Bake

Pour the apple mixture into the prepared skillet. Remove the topping from the fridge and sprinkle it evenly over the apples, covering the entire surface right up to the edges. Bake for 45–55 minutes, or until the topping is deep golden brown and the apples are bubbling heavily around the edges. (If the topping browns too fast, tent the skillet loosely with foil.)

5. Cool & Serve

Remove from the oven and let the apple crisp rest for 10–15 minutes. This essential cooling time allows the fruit juices to thicken, ensuring each scoop holds together with that perfect, saucy consistency. Serve warm with vanilla ice cream.

Pro Tips & FAQ: The Perfect Crisp

The Best Gluten Free Apple Crisp

5 from 3 votes

This cast iron apple crisp is my go-to fall dessert—tart Granny Smith apples, a deep, toasty dark brown sugar oat topping, and that rustic texture you only get from baking in a 10-inch cast iron skillet.

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Prep Time 20 minutes mins

Cook Time 50 minutes mins

Total Time 1 hour hr 10 minutes mins

Servings: 12 servings

Course: Dessert

Cuisine: American

Calories: 387

Ingredients Equipment Method Nutrition Notes

Ingredients

  

1x2x3x?

• 6 large Granny Smith apples, peeled and chopped
• 1 1/4 cup dark brown sugar for the filling
• 2 1/2 tablespoons all-purpose flour for the filling
• 2 1/2 teaspoons ground cinnamon for the filling
• 1/2 teaspoon salt for the filling
• 2 1/2 teaspoons vanilla extract
• 2 1/2 tablespoons lemon juice
• 1 1/4 cup old-fashioned rolled oats
• 1 1/4 cup dark brown sugar for the topping
• 3/4 cup all-purpose flour for the topping
• 2 1/2 teaspoons ground cinnamon for the topping
• 1/2 teaspoon salt for the topping
• 10 tablespoons cold butter, cubed

Equipment

1 10-inch cast iron skillet

Method

 

1. Preheat your oven to 350°F (177°C). Lightly grease a 10-inch cast iron skillet with butter or a light spray of oil.
   
2. In a large mixing bowl, combine the chopped Granny Smith apples, 1 1/4 cups dark brown sugar, 2 1/2 tablespoons flour, 2 1/2 teaspoons cinnamon, 1/2 teaspoon salt, vanilla extract, and lemon juice. Toss until every piece of apple is evenly coated and the mixture looks glossy and clumpy.
   6 large Granny Smith apples, peeled and chopped, 1 1/4 cup dark brown sugar, 2 1/2 tablespoons all-purpose flour, 2 1/2 teaspoons ground cinnamon, 1/2 teaspoon salt, 2 1/2 teaspoons vanilla extract, 2 1/2 tablespoons lemon juice
   
3. Pour the apple mixture into the prepared cast iron skillet and spread it into an even layer, making sure apples reach all the way to the edges.
   6 large Granny Smith apples, peeled and chopped
   
4. In a medium bowl, whisk together the oats, 1 1/4 cups dark brown sugar, 3/4 cup flour, 2 1/2 teaspoons cinnamon, and 1/2 teaspoon salt. Add the cold cubed butter. Using a pastry cutter or your fingers, cut the butter into the dry ingredients until the mixture forms coarse crumbs with some larger clumps.
   1 1/4 cup old-fashioned rolled oats, 1 1/4 cup dark brown sugar, 3/4 cup all-purpose flour, 2 1/2 teaspoons ground cinnamon, 1/2 teaspoon salt, 10 tablespoons cold butter, cubed
   
5. Sprinkle the oat mixture evenly over the apples, covering the entire surface. Gently press it down so it adheres, but do not pack it too tightly—this keeps the topping extra crisp.
   1 1/4 cup old-fashioned rolled oats, 1 1/4 cup dark brown sugar, 3/4 cup all-purpose flour, 2 1/2 teaspoons ground cinnamon, 1/2 teaspoon salt, 10 tablespoons cold butter, cubed
   
6. Bake for 45–55 minutes, or until the topping is deep golden brown, the apples are bubbling around the edges, and the center looks set. Cast iron holds heat well, so start checking at 45 minutes and continue baking as needed.
   
7. Remove from the oven and let the apple crisp rest for 10–15 minutes. This cooling time lets the juices thicken slightly so each scoop holds together. Serve warm straight from the skillet with vanilla ice cream or Greek yogurt, if desired.
   

Nutrition

Calories: 387kcalCarbohydrates: 74gProtein: 3gFat: 10gSaturated Fat: 6gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gTrans Fat: 0.4gCholesterol: 25mgSodium: 284mgPotassium: 232mgFiber: 4gSugar: 56gVitamin A: 354IUVitamin C: 6mgCalcium: 62mgIron: 1mg

Notes

For a softer topping, tent the skillet loosely with foil for the first 20 minutes of baking, then remove the foil to let it brown. For extra texture, add a handful of chopped pecans or walnuts to the oat topping.

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