You catch the smell through the steam vent and suddenly you are starving. The sweet scent of cinnamon and ripe plums kinda hits you unexpectedly and it’s just irresistible. You find yourself patting the lid, waiting for that tender pull moment when you can finally open it up.

That warm scent fills your kitchen, making you remember every time you enjoyed a slice of a good fruit cake fresh from the oven. Except this one’s different because you’re not using oil, yet it’s moist and soft in a way that’s totally surprising. It’s pressure cooker magic without any fuss.
As the steam cues from the vent slow, you feel your anticipation grow. You think about how easy this recipe is gonna be to whip up on a regular day, no oven sweat or long wait times. Just simple ingredients coming together while you check some emails or catch a quick break.
Why Your Cooker Beats Every Other Pot
- Pressure cooks in way less time compared to a regular oven, so you get your cake faster.
- It keeps all the moisture locked inside, giving you a cake that’s super tender and soft.
- Natural release helps the cake finish gently, stopping it from drying out or getting tough.
- You don’t gotta heat up the whole kitchen, which is awesome on warm days.
- The steam cues tell you when it’s almost done, so you’re never guessing or overcooking.
- Cleanup’s easier since you’re cooking everything in one pot without extra pans.
All the Pieces for This Meal
- 1 ½ cups oat flour (gluten-free if you need it)
- ¾ heaped cup ground nuts of your choice (walnuts or almonds work great)
- ½ cup granulated sweetener you like (could be sugar or a natural alternative)
- 1 ½ teaspoon baking powder
- ½ teaspoon baking soda
- 1 ½ teaspoon cinnamon to boost that cozy vibe
- ½ teaspoon allspice (totally optional but I love it)
- ½ teaspoon cardamom for some extra warmth (optional)
- ⅓ teaspoon salt to balance flavors
- ⅔ cup plant-based milk (almond or oat milk is perfect)
- 1 small ripe mashed banana or ⅓ cup applesauce for moisture
- 1 tablespoon lemon or lime juice to brighten things up
- 1 teaspoon vanilla extract for flavor
- 3-4 plums sliced (you want them ripe but firm)
- 1 tablespoon maple syrup for topping
- 1 tablespoon sugar to sprinkle on plums

Walking Through Every Single Move
First off, you gotta prepare your cake pan. Grease it well or line it with parchment so the plums peel right off when you flip it.
Next, toss all the dry ingredients in a bowl. That’s the oat flour, nuts, sweetener, baking powder, soda, cinnamon, and spices. Give it a good stir so everything is evenly mixed.
In a separate bowl, mash your banana or scoop your applesauce. Add the plant milk, lemon juice, and vanilla to that. Mix it until it looks smooth.
Slowly combine wet and dry ingredients, stirring till you get a thick batter. It’s kinda sticky but smooth enough to pour.
Now spread the sliced plums in the pan, arranging them pretty side down. Sprinkle sugar on top to help caramelize them as it cooks.
Pour your batter over the plums, making sure it covers them evenly. No peeking yet, you gotta trust the pressure cooker to work its thing.
Close the lid, seal it up, and set to high pressure. Let it cook for about 20 minutes. Then you use natural release; this is key so the cake stays tender and doesn’t shrink. When the steam cues slow, carefully open and let the cake cool a bit before flipping it onto a plate.

Easy Tweaks That Make Life Simple
- If you’re in a hurry, slice the plums a little thinner so they soften faster inside the pressure cooker.
- Swap the nuts for seeds if you gotta avoid nuts but still want that crunch and nutrition.
- Use applesauce instead of banana to keep the flavor neutral and make it sweeter without extra sugar.
When You Finally Get to Eat
The first slice comes out with the plums perfectly caramelized on top, looking glossy and inviting. You notice how soft the crumb is, totally tender with little air pockets that make it melt in your mouth.
With every bite, you feel the warming spices heating up your senses. Cinnamon and cardamom kinda sneak in just to remind you this cake’s not just sweet, it’s cozy and satisfying.
You savor the juicy plum slices balancing just right with the sweet tender cake beneath. It works real good as a snack or dessert, warm or at room temp, especially with a cup of tea nearby.
Smart Storage That Actually Works
After it cools completely, keep your cake in an airtight container to hold in moisture and flavors. It lasts great this way for a couple of days.
If you need to save it longer, pop it in the fridge. Just let it come back to room temp before eating to get that soft texture back.
For even longer stash, slice and wrap individual pieces in plastic wrap and freeze. Thaw them overnight in the fridge or warm gently in your microwave or pressure cooker on slow release setting.
Your Most Asked Questions Answered
- Can I use regular flour instead of oat flour? Yeah, you can swap for all-purpose flour, but the texture might be a bit different and not gluten-free anymore. Also see our healthy taco casserole recipe for a gluten-free meal idea using oat flour.
- Do I have to use ripe bananas? Yep, ripe ones work best since they add moisture and sweetness naturally without weird flavors.
- What kind of plant milk is best? I like almond or oat milk 'cause they don’t overpower the spices, but use whatever you got.
- Is allspice really necessary? Nope, it’s optional. If you don’t have it, just bump up the cinnamon or skip it totally. Check our apple cider vinegar pulled pork for spice variations with pressure cooking.
- How do I know when the cake is done? You’ll see steam cues slow down and when you do a tender pull test with a toothpick it should come out clean.
- Can I add other fruits instead of plums? Totally. Peaches, nectarines, or even apples work great, just adjust the cooking time a bit.

Upside Down Plum Cake (Oil-Free)
Ingredients
Main ingredients
- 1 ½ cups oat flour gluten-free if you need it
- ¾ heaped cup ground nuts walnuts or almonds work great
- ½ cup granulated sweetener could be sugar or a natural alternative
- 1 ½ teaspoon baking powder
- ½ teaspoon baking soda
- 1 ½ teaspoon cinnamon to boost that cozy vibe
- ½ teaspoon allspice totally optional but I love it
- ½ teaspoon cardamom for some extra warmth (optional)
- ⅓ teaspoon salt to balance flavors
- ⅔ cup plant-based milk almond or oat milk is perfect
- 1 small ripe banana mashed or ⅓ cup applesauce for moisture
- 1 tablespoon lemon or lime juice to brighten things up
- 1 teaspoon vanilla extract for flavor
- 3-4 plums sliced, ripe but firm
- 1 tablespoon maple syrup for topping
- 1 tablespoon sugar to sprinkle on plums
Instructions
Instructions
- Prepare your cake pan by greasing it well or lining it with parchment so the plums peel right off when you flip it.
- Toss all the dry ingredients (oat flour, nuts, sweetener, baking powder, soda, cinnamon, and spices) in a bowl and stir until evenly mixed.
- Mash the banana or scoop the applesauce into a separate bowl, then add the plant milk, lemon juice, and vanilla. Mix until smooth.
- Slowly combine wet and dry ingredients, stirring until you get a thick, sticky but smooth batter.
- Spread the sliced plums in the pan, arranging them pretty side down. Sprinkle sugar on top to help caramelize while cooking.
- Pour your batter over the plums, making sure it covers them evenly. Close the lid, seal it up, and set to high pressure.
- Let it cook for about 20 minutes, then use natural release to keep the cake tender and prevent shrinking.
- When steam cues slow, carefully open and let the cake cool a bit before flipping it onto a plate.




