How many servings does this recipe make?

This recipe makes 4 servings. You can adjust the portion size directly on this page.

What ingredients do I need for Rhubarb Hazelnut Oatmeal Squares?

You need 14 ingredients. The key ingredients include: For Rhubarb, 3 1/2 cups Fresh rhubarb, cut into 1-inch chunks, 2/3 cup sugar, 2 tablespoons cornstarch, and more.

Is Rhubarb Hazelnut Oatmeal Squares suitable as baking & desserts?

Yes, Rhubarb Hazelnut Oatmeal Squares falls under the Baking & Desserts category and is a great choice for this type of meal.

How do I store leftover Rhubarb Hazelnut Oatmeal Squares?

Store in an airtight container at room temperature for up to 3–5 days. For longer storage, freeze for up to 3 months — no need to refrigerate or reheat.

Rhubarb Hazelnut Oatmeal Squares Recipe

Name: Rhubarb Hazelnut Oatmeal Squares
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: For Rhubarb; 3 1/2 cups Fresh rhubarb, cut into 1-inch chunks; 2/3 cup sugar; 2 tablespoons cornstarch; 1/4 cup orange juice; 1/4 teaspoon nutmeg; 1 teaspoon vanilla; For the Hazelnut Oatmeal Crumble; 1 1/2 cups quick oatmeal; 1 1/2 cups flour; 1/2 teaspoon baking soda; 2/3 cup dark brown sugar; 1/2 cup hazelnuts, finely chopped; 1 1/2 sticks unsalted butter, room temperature

Start your day right with this Rhubarb Hazelnut Oatmeal Squares recipe. Made with Rhubarb, Fresh rhubarb, sugar and cornstarch. Easy step-by-step instru…

This Rhubarb Hazelnut Oatmeal Squares relies on simple, everyday ingredients such as for rhubarb, sugar, cornstarch and orange juice. It comes together quickly and makes 4 servings, at about 775 kcal each. The step-by-step instructions below are written to be easy to follow, even on a busy day.

Whether you're rounding off a family dinner, bringing a treat to a gathering, or simply satisfying a sweet craving, this Rhubarb Hazelnut Oatmeal Squares delivers. Serve it warm or at room temperature, and add a scoop of ice cream or a spoonful of whipped cream for an extra-special finish.

Updated Jun 30, 2026

Serves 4 Baking & Desserts

Tips for the best results

Read through all the steps once before you start and measure out your ingredients first — it makes everything go more smoothly.
Preheat the oven fully and bake on the middle rack for the most even results.
Check for doneness a few minutes early — a toothpick in the center should come out with just a few moist crumbs.
Let it cool before slicing so it sets properly and holds its shape.
Store leftovers in an airtight container in the fridge and enjoy within a few days.

Variations & substitutions

Use a neutral oil or a plant-based spread in place of butter for a dairy-free version.
Brown sugar instead of white sugar adds a deeper, more caramel-like flavor.
Leave out the nuts to make it nut-free, or swap in seeds for a similar crunch.
A good 1:1 gluten-free flour blend works well if you need a gluten-free version.

No specific allergen information. Please check the ingredient list for possible allergens.

My Personal Notes

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Rhubarb Hazelnut Oatmeal Squares

Tips for the best results

Variations & substitutions

My Personal Notes

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