There is no crust in this one. That is the whole idea behind these sugar-free apple crumble recipes: sliced apples go straight into the dish, the crumble goes on loose, and the oven does everything else.
Two cups of thinly sliced Granny Smith, tossed with allulose, cinnamon, and a splash of lemon juice, sit under a crumble of blanched almond flour, oat fiber, allulose, and butter. It bakes at 350°F (175°C) for 30 to 35 minutes in a 6×6-inch ceramic dish, rests 20 minutes, and serves eight.
My sugar-free Dutch apple pie is the other way to do apple and crumb: a thin almond crust, apples cooked down on the stove until the liquid is gone, a streusel with chopped pecans, and a caramel drizzle over the top. This one skips all of that. No crust to roll, no skillet step, no pecans in the topping, just apples and crumble in a dish.
Why You’ll Love This Sugar-Free Apple Crumble
- One dish, one oven, one bowl to wash. The apples go straight in, the crumble mixes in the same bowl you already used, and there is no dough to roll or chill.
- A loose topping, not a crust. Scattering the crumble instead of pressing it is what gives this sugar-free apple crumble both small crumbs and larger clusters in the same spoonful.
- Real apple flavor. Two cups of thinly sliced Granny Smith at about 1/8 inch keep their shape and stay juicy instead of turning to sauce.
- Almond crumble that tastes toasted. Blanched almond flour, oat fiber, and softened butter brown better than wheat crumb and stay tender.
- About 115 calories a serving. Eight servings come out of one small dish, and the 20-minute rest is the only patience required.
For the apples turned into something richer, my sugar-free caramel pecan apple pie bakes a tall fruit filling under a buttery pecan caramel, and my sugar-free caramel apple cinnamon cheesecake puts the same caramel apples on top of a baked cheesecake. This one stays a bowl of crumble.
Ingredient Notes
Granny Smith is doing the work here. 2 cups of peeled, cored apple sliced thin (240g) bring the tartness that makes crumble taste like fall rather than like cinnamon sugar, and the thickness is what decides whether they soften evenly.
3 tbsp of granulated allulose (45g) goes into the apples, and 1 tbsp of fresh lemon juice (15g) keeps the cut edges bright. Cinnamon splits the work: 1 tsp (3g) with the fruit, ½ tsp (1g) in the topping.
The crumble is 1/2 cup + 2 tbsp of blanched almond flour (72g), 3 tbsp of oat fiber (10g), another 3 tbsp of granulated allulose (45g), 3 tbsp of softened unsalted butter (42g), and ½ tsp of cinnamon (1g). Allulose is a rare sugar, and the FDA allows it to be excluded from the total sugars and added sugars declarations on the Nutrition Facts label.
Weigh the oat fiber rather than scooping it. A little extra is what dries a crumble topping out, and the note that follows is the whole reason this sugar-free apple crumble stays tender under the heat.
The butter needs to be softened, not melted. Melted butter turns the crumble into sand, while softened butter mixed with a fork gives you the mix of small crumbs and squeezable clusters the recipe is after.
Every calorie and macro on the card below comes from those ingredient weights worked out against USDA FoodData Central, the reference I use whenever I need to check what an ingredient actually contributes.
How to Make Sugar-Free Apple Crumble
Two mixing steps, then the oven. The only thing worth measuring properly is the oat fiber, and the only thing worth doing slowly is scattering the crumble. That is the entire job, and it is why sugar-free apple crumble works as a weeknight bake as easily as a holiday one.
- Heat the oven to 350°F (175°C).
- Toss the sliced apples with 3 tbsp allulose, 1 tsp cinnamon, and lemon juice. Spread evenly in the baking dish.
- In a bowl, mix almond flour, oat fiber, remaining allulose, butter, and 1/2 tsp cinnamon with a fork until moist crumbs form. Squeeze some of the mixture to create larger clusters.
- Scatter the crumble loosely over the apples without pressing down.
- Bake 30–35 minutes until the apples are tender and the topping is golden. If the crumble browns too quickly, cover loosely with foil for the remaining bake time.
- Rest 20 minutes before serving.
Success Tips
- Slice the apples about 1/8 inch thick. Thicker slices stay raw in the middle while the crumble above them is already golden.
- Weigh the oat fiber so the topping stays moist, not dry. It is the easiest ingredient to overdo and the hardest to walk back.
- Keep a mix of small crumbs and larger clusters. Squeezing a few handfuls together before scattering is what gives this sugar-free apple crumble a proper texture instead of an even layer of sand.
- Do not press the crumble down. It settles on its own in the heat, and pressing it makes a lid.
- Expect a juicy filling rather than a stiff or gelled one. If the syrup between the apples thickens too much, the apple slices were cut thick or the dish was overfilled.
Storage
The recipe builds in one rest, and it is the only one it specifies: 20 minutes after it leaves the oven, before anyone serves it. That is enough for the filling to stop running and for the crumble to set enough to scoop.
Cover the dish loosely if it is sitting out, and keep the rest of it in the refrigerator. The recipe does not go past that, so plan to serve this sugar-free apple crumble the same day it is baked rather than building the meal around leftovers.
Sugar-Free Apple Crumble FAQ
Do I need a crust for sugar-free apple crumble?
No, and that is the difference from most apple crumble recipes. The apples go straight into the dish under the topping, so there is no dough to roll, chill, or bake blind, and this sugar-free apple crumble goes from chopping to oven in one go.
What kind of apples work best?
Granny Smith, peeled and cored, sliced to about 1/8 inch. The tartness holds up next to the cinnamon, and the thin slices soften in the same 30 to 35 minutes the crumble needs to turn golden, which is what keeps sugar-free apple crumble juicy rather than stewed.
Why is my crumble topping dry?
Almost always too much oat fiber. Weigh the 3 tbsp instead of scooping it, mix with a fork until the crumbs are just moist, and remember that the topping should not be pressed onto the apples. Any of those three will bring this sugar-free apple crumble back to tender.
How long does sugar-free apple crumble bake?
30 to 35 minutes at 350°F (175°C), until the apples are tender and the topping is golden. If the crumble is browning faster than the fruit is softening, cover it loosely with foil and let it finish.
Can I make this ahead and reheat it?
The recipe does not cover reheating, so I would not plan the meal around it. It bakes in about half an hour and rests 20 minutes, which is easier to time than to store, and this sugar-free apple crumble is at its best with the filling still juicy.
When you want a warm apple dessert that costs you one dish and one bowl, this sugar-free apple crumble is the one to bake. Full weights, times, and notes are in the card below.
Sugar-Free Apple Crumble
Ingredients
Equipment
Method
- Heat the oven to 350°F (175°C).
- Toss the sliced apples with 3 tbsp allulose, 1 tsp cinnamon, and lemon juice. Spread evenly in the baking dish.
- In a bowl, mix almond flour, oat fiber, remaining allulose, butter, and 1/2 tsp cinnamon with a fork until moist crumbs form. Squeeze some of the mixture to create larger clusters.
- Scatter the crumble loosely over the apples without pressing down.
- Bake 30–35 minutes until the apples are tender and the topping is golden. If the crumble browns too quickly, cover loosely with foil for the remaining bake time.
- Rest 20 minutes before serving.
Notes
- Slice the apples about 1/8 inch thick for even softening.
- Weigh the oat fiber so the topping stays moist, not dry.
- Keep a mix of small crumbs and larger clusters for the best texture.
- The filling should stay juicy rather than stiff or gelled.