Rhubarb Impossible Pie is a nostalgic, old-fashioned dessert featuring tart rhubarb baked into a creamy custard-like filling that forms its own light crust as it bakes. This easy rhubarb impossible pie recipe is simple to make and delivers the perfect balance of sweet and tangy flavor.
Two of the most popular impossible pies that I have made are Impossible Coconut Rum Pie and Mexican Impossible Pie. They were very popular to make in the 1960s, when women wanted the convenience of an easy recipe using Bisquick.
Bisquick by Betty Crocker now has a gluten-free version, but I have not tried it. If you have, I would love to hear what you think of it and if it works the same in most recipes or if you need an adjustment.

Rhubarb is hands down one of the “fruits” I love to bake with. Did you know that rhubarb is actually a vegetable and not a fruit at all? I also love making Impossible Pies, I got the first few recipes from my mother’s recipe box. This Rhubarb Impossible Pie recipe though I created and it is an amazing way to enjoy rhubarb.
Why I Love This Recipe
- Easy recipe to make
- Love rhubarb and have lots in our garden
- Love how the recipe makes it own layers while baking
- Crowd pleaser
- Perfect dessert for spring and early summer
Helpful Items for This Recipe
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3 Rhubarb Plants – Crimson Red

Using the Bisquick in this recipe is what makes it impossible. It creates a creamy custard-like filling where the fruit floats up on top, and the Bisquick helps form its own crust at the bottom.
Impossibly easy, you say? Yup, it sure is. It is like a magic pie!
The added bonus of this recipe is the gorgeous streusel topping. This is something that you don’t see on most impossible pies but I thought it added so much more to the pie and is very easy to make by hand or in a food processor.
Impossible Rhubarb Pie Ingredients

The streusel topping has the addition of 1/2 cup of walnuts which just adds the perfect crunchy texture to the fruit and creamy custard underneath. We love baking with rhubarb and I will share some of my other recipes with you also.
Ingredients
Rhubarb – Fresh rhubarb that is chopped works great but you can also use frozen, just adjust the time to bake accordingly.
Eggs – I use fresh eggs and always large unless otherwise stated.
Bisquick – This is easy to find in almost every grocery store.
Butter – This needs to be melted so it mixes into the custard. I use salted butter.
Salt, Cinnamon, Nutmeg – These are the spices that make the pie so delicious.
Sugar – I have used granulated sugar for this recipe.
Vanilla extract – An old standby that not only flavors but balances.
Milk – Doesn’t really matter milk you use but the higher the fat content the richer the pie will be.
Streusel Topping
Butter – For the streusel topping the butter has to be cold.
Bisquick – This is used in the topping as well.
Brown sugar – For the streusel I like molasses flavor of brown sugar.
Cinnamon – A little bit of cinnamon here flavors the topping also.
Walnuts – Chopped, this is optional but in my mind makes the streusel.
How to Make Impossible Rhubarb Pie




Preheat oven to 375F. Grease a 10″ pie plate.
Place rhubarb into pie pan.
Blend the eggs, Bisquick, melted butter, salt, cinnamon, nutmeg, sugar, vanilla and milk for 3 minutes in a blender.
Pour the custard over the rhubarb.



Mix together the streusel topping by blending the butter with the Bisquick, brown sugar and cinnamon. You can do this by hand or in a food processor. Blend until well mixed and then add in the nuts. Sprinkle on top of the pie.

Bake for 45-55 min. or until set in the center. Cover with tin foil if it is getting too browned.

So simple you won’t believe it!! If you don’t add the streusel topping, the rhubarb floats up to the top and is pretty like that also!!
Either way, this recipe would be great served up with vanilla bean ice cream or whipped cream, too.

Recipe Pro Tips

Growing Rhubarb
Rhubarb is very easy to grow and is almost like a weed. Pick a good spot free of weeds that gets direct sunlight. Also, make sure the soil is fertile and well-drained.
I have a stepped-down garden that is at the side of my house, and the two top smaller beds are filled with lava rock and about 7 or 8 large rhubarb plants.
They do very well in this garden and let me yield about 30 cups or more each year, which a lot of it ends up going into my freezer for later use. You may only want to plant 1-3 plants, depending on how much you want to harvest.
Rhubarb is a perennial that comes back each year and the plants may even get bigger and bigger each year if they love the spot they are planted in. Don’t pick all the rhubarb as the plant likes to have some stalks left to replenish the plant.
Word of caution is that the leaves are highly poisonous. I get rid of them into the compost while I am outside and don’t even bring them into the house.
Rhubarb I would say does best in the northern climes as it likes a colder winter and a cooler summer for the most part.

So give this wonderful pie a try the next time you come across rhubarb or your next harvest, or if you are lucky, you still have some in the freezer.
It would be equally good for an afternoon tea as it would be for a dessert or brought to a picnic or potluck!! ENJOY!!

LOVE RHUBARB AND WANT MORE?
Here are all of our wonderful rhubarb dessert recipes!
- Rhubarb Dream Bars
- Rhubarb Upside Down Cake
- Old Fashioned Rhubarb Loaf
- Rhubarb Fool
- Raspberry Rhubarb Clafoutis
- Rhubarb Pudding Cake
- Super Easy Rhubarb Tarts
- No Churn Rhubarb Ice Cream Recipe
- Blueberry Rhubarb Jam
- Rhubarb Strawberry Cobbler
- Strawberry Rhubarb Cake
- Rhubarb Strawberry Crisp
- Rhubarb Strawberry Sour Cream Pie
Pin it HERE!!

Pin it HERE!!


Rhubarb Impossible Pie Recipe
Video
Ingredients
- 3 cups rhubarb chopped
- 3 eggs
- 1/2 cup Bisquick
- 3 Tbsp. melted butter
- 1/4 tsp. salt
- 1 tsp. cinnamon
- 1/4 tsp. nutmeg
- 1 1/4 cups sugar
- 1 tsp. vanilla extract
- 1 cup milk
Streusel Topping
- 2 Tbsp. butter cold
- 1/2 cup Bisquick
- 1/4 cup brown sugar
- 1/2 tsp. cinnamon
- 1/4 cup walnuts chopped
Instructions
- Preheat oven to 375F. Grease a 10″ pie plate.
- Place rhubarb into pie pan.
- Blend the eggs, Bisquick, melted butter, salt, cinnamon, nutmeg, sugar, vanilla and milk for 3 minutes in a blender.
- Pour the custard over the rhubarb.
- Mix together the streusel topping by blending the butter with the Bisquick, brown sugar and cinnamon. Blend until well mixed and then add in the nuts. Sprinkle on top of the pie.
- Bake for 45-55 min. or until set in the center. Cover with tin foil if it is getting too browned.











Comments & Reviews
Melissa says
Does this pie need a bottom pie crust or do you put the rhubarb straight into the pie dish?
Tara Noland says
The beauty of an Impossible Pie is that the layers are created on their own. No need for a crust. I will be doing this recipe with better pictures soon so stay tuned but in the meantime you can certainly make it and you will see how awesome it is.
Jan Hazen says
Absolutely delicious!!!! I made this for my brother who is very picky about his desserts. This was a 2 thumbs up!!!!
Tara Noland says
So glad this was enjoyed. The flavor of rhubarb is like no other, so good!!
Lori Mitzel says
I promised my family a strawberry rhubarb pie. Now I see this delicious looking recipe that I want to try , and to add strawberries. What are your thoughts?
Tara Noland says
Yes, you can substitute some strawberries also in there.
Carol Lynn Clausson says
So delicious
Annette says
Can I make individual pies in 5” aluminum pie pans? Do you know much rhubarb and custard I would put in each pie pan and how long would I bake them? Thanks and I love all your recipes.
Ken Noland says
Sorry, I have not tried this so I can’t say for sure.
Annette says
Thanks Ken. If I try it I’ll let you know.
Gene says
What do you do if you have no bisquick?
Tara Noland says
Just search homemade Bisquick and pick a recipe you like.
Sharon says
Wow! What an easy recipe to make. Smells great! Tastes great too.
Ken Noland says
Thanks for the comment! So glad you enjoyed it!
Annie says
This is a very easy way to make rhubarb custard pie. Especially if you don’t like crusts. My rhubarb was frozen. And the pieces were cut a little too big to my liking. But that had nothing to do with the recipe. It’s just what I had on hand at the time. I liked this recipe, and will make it again. Especially since I have Bisquick on in my pantry😉 .
Tara Noland says
So glad you enjoyed the recipe!!! Thanks for taking the time to tell us.