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 Rhubard Upside-Down Cake ?

You need 14 ingredients. The key ingredients include: 2/3 C. boiling water, 1/2 C. quick cooking rolled oats, 2 Tbsp. marg. or butter, 1/3 C. granulated Sugar, and more.

Is Rhubard Upside-Down Cake suitable as baking & desserts?

Yes, Rhubard Upside-Down Cake falls under the Baking & Desserts category and is a great choice for this type of meal.

How do I store leftover Rhubard Upside-Down Cake ?

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.

Rhubard Upside-Down Cake Recipe

Name: Rhubard Upside-Down Cake
Prep time: 15 min
Cook time: 30 min
Total time: 45 min
Yield: 4 servings
Ingredients: 2/3 C. boiling water; 1/2 C. quick cooking rolled oats; 2 Tbsp. marg. or butter; 1/3 C. granulated Sugar; 2 C. diced rhubarb; 1 C. flour; 1 tsp. baking power; 1/4 tsp. baking soda; 1/2 tsp. ground cinnamon; 1/4 tsp. salt; 2/3 C. granulated sugar; 1/2 C. paked brown sugar; 1/4 C. cooking oil; 1 egg

Bake this irresistible Rhubard Upside-Down Cake at home. Made with boiling water, oats, marg and Sugar. Easy step-by-step instructions included.

This Rhubard Upside-Down Cake relies on simple, everyday ingredients such as boiling water, quick cooking rolled oats, marg. or butter and granulated sugar. It comes together quickly and makes 4 servings, at about 1255 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 Rhubard Upside-Down Cake 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

1255

kcal

Calories

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.
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

Saved locally in your browser — visible only to you.

Rhubard Upside-Down Cake

Tips for the best results

Variations & substitutions

My Personal Notes

How did you like this recipe?

Frequently Asked Questions