½ teaspoonground cardamom(if you prefer, an additional ½ ground cinnamon can be substituted)
¼ teaspoonground nutmeg
For the topping:
¼ cupunsalted butter, melted
½ cuplight brown sugar, firmly packed
¼ teaspoonground cardamom(or ground cinnamon)
1 ½ cupschopped rhubarb (about 5 rhubarb stalks cut into ½ -inch pieces )
Instructions
Spray a 7-inch cake pan with nonstick cooking spray and line the bottom with parchment paper. Spray parchment paper with nonstick cooking spray, set aside.
In a large mixing bowl, beat ½ cup butter until fluffy. Add sugar and beat again. Add eggs and egg yolk and beat until fluffy. Add yogurt and vanilla extract and beat to combine.
Add dry ingredients on top (flour, baking powder, cinnamon, salt, ½ teaspoon cardamom, nutmeg) and mix them together gently before beating them into the wet ingredients, scraping down sides as needed. Set aside while you make topping.
In a small bowl, combine melted butter with brown sugar, chopped rhubarb, and ¼ teaspoon cardamom. Spread mixture into the bottom of the prepared cake pan.
On top of rhubarb mixture, spread cake batter into an even layer (batter will be thick). Cover pan with a paper towel and then wrap tightly with foil.
In the bottom of a 6-quart Instant Pot insert, add 1 cup of cold water. Place covered cake pan on top of steamer insert and carefully place it in the Instant Pot. Cover the Instant Pot and turn valve to seal. Set Instant Pot to Pressure Cook (or Manual, high pressure) for 60 minutes.
When the timer goes off, let the Instant Pot naturally release for 10 minutes. Carefully release remaining pressure (quick release) and remove the cake from the Instant Pot.
Remove foil and paper towel and run a butter knife around the edges of the cake pan. Place a heat-safe plate that has a rim (not a cake stand!) over the cake pan. Holding the plate in place, carefully flip the plate and pan over. Slowly remove cake pan from cake.
Notes
If rhubarb isn't in season or you don't like it, this recipe is also delicious with chopped apples.
If your cake pan is tall like mine, you can make aluminum foil "handles" for your steamer basket to make it easier to remove the pan when it is finished cooking. Wrap a double-thick piece of foil around the handles of the steamer tray to make them longer so you can use those to lift it out when it's done cooking.