Blueberry Rhubarb Custard Pie

Surprisingly blueberries and rhubarb really do go together so well. Blueberries are uncooked: with milk or cream or baked in a cobbler or a fruity crisp. Rhubarb is called the pie plant for good reason; it makes a lovely pie from a humble plant stem. But this, this is my current obsession, the two together in a custard pie. Not just any old custard but one made with Greek yogurt and eggs. Easy to throw together, creamy, never runny textured and a lusciously fruity flavor that may make you have to eat a second slice! The blueberries do tend to take over the rhubarb flavor of this pie. Of course, there are more than twice as many blueberries by volume and they are just a stronger flavor than rhubarb which gives a bit of a tart under taste to this pie. You could play with the proportions of the two fruits; this is the amounts which I used. This pie will be tasty to even the biggest rhubarb dissenter. Really!

WARNING: This pie goes soft in 2 humid days so plan to gobble it down within that time frame or face the soggy crust syndrome. Inevitable with gf crust and a custard filling in hot/humid weather.

I don’t recommend frozen or canned fruit for this pie, simply not good enough and you must use plain, unsweetened Greek yogurt in the filling, plain yogurt is too runny. And no, it can’t be made without the eggs it just wouldn’t work as a custard if there are no eggs. The version with peaches uses 3 yolks in there. I tried it with two whole eggs beaten up: success! And one last warning; applicable to 100 percent of my recipes: Please don’t try it with Measure for Measure gf flour; this is calibrated for using King Arthur’s Basic GF Blend.

I hope you give it a try; super easy and super delicious. Best pie of the summer hands down! Make one Saturday morning…we couldn’t wait for a slice still faintly warm……. I thought I took a picture of a slice; no luck there and it is all gone. Next time! It does look pretty much like the blueberry peach custard pie I posted last summer.

Naked pie! About to go in and bake for 25 minutes and then the crumbs go on top.
Just out of the oven….cooling…a molten mass of fruit and custard and sugary crumbs!

Angie’s Blueberry and Rhubarb Custard Crumb Pie


1 c plus 2 tbsp brown rice flour mix (at bottom of recipe)

2 tbsp sweet rice flour

1 Tbps granulated sugar

½ tsp xanthan gum

¼ tsp salt

6 Tbps cold butter cut into 6 chunks

1 large egg

2 tsp fresh orange or lemon juice

Spray 9 or 10 inch metal pie pan with cooking spray, dust with white rice flour.

Mix dry ingredients in bowl of stand electric mixer.  Add butter and mix until crumbly and resembling coarse meal.  Add egg and juice.  Mix until it comes together into big chunks.  Shape into a ball with your hands. Put it on a crust sized piece of wax paper (14 x 14 inches more or less), flatten the crust ball some; put on top of it another piece of wax paper and chill it all in your fridge 15-20 minutes while you prepare the filling.


2-3 cups sliced fresh rhubarb cut in half inch slices (2 cups if 9 inch pie, 3 cups for 10 inch pie)

4 cups blueberries; rinsed

2/3 cup sugar, sweeter if you like it that way or if peaches are not fully ripe

2 Tbsp. tapioca starch

Mix in a medium bowl the following ingredients:

1 cup plain Greek yogurt, I prefer whole milk, and let it warm up a bit

2 whole large eggs or 3 egg yolks, close to room temp.

1 tsp. pure vanilla extract

2 tbsp. brown rice mixture flour (King Arthur Basic GF blend)

Crumb topping

¾ c brown rice flour mix (King Arthur Basic GF Blend)

½ c sugar

½ tsp xanthan gum

1/2 tsp. cinnamon

1/3 c cold butter cut into six chunks

Put all five ingredients in the same mixing bowl you made the bottom crust in and mix well with mixer paddle until crumbs form.


Directions: Turn oven on to 400 degrees. Put the oven rack on the closest to the bottom shelf position. Once the crust is chilled some but not hard, Roll it out and fit into the pie shell. Trim off excess crust. I like to chill those crumbs of crust and roll out to make a jam filled hand pie. Anyway, put the sliced rhubarb and blueberries in a bowl and add the sugar and tapioca. Let stand 5 minutes. Then pour into the pie shell in a fairly even layer, as the filling and crumbs will hide it there is no need for a pretty design. Then pour the filling that you just mixed up over it , tap the pie on the counter sharply 2-3 times to settle in the filling and bake for 25-30 minutes. I turned down my oven to 375 after 15 to 20 minutes. While it bakes those 25-30 minutes make the crumbs. When your timer goes off, carefully remove the pie from the oven and sprinkle the top of the pie with crumb mix;  I used about 3/4 of it but you could use a bit less if you don’t want a thick crumb layer or all of it for a really heavy crumb. Bake an additional 15-20 minutes until crumbs are lightly browned. Let stand at least 1 to 11/2 hours before slicing and serving. Enjoy!

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