Do your lips pucker up at the mention of a kiwi? Maybe it’s just me… All too often I’ve eaten sour kiwis, especially in the winter, no matter how long I let them ripen on the counter. Luckily in the summer, sour kiwis aren’t a problem, and in fact I ended up with a surplus of ripe kiwis recently. So I’m excited to be sharing with you some refreshing kiwi vanilla cupcakes with kiwi buttercream frosting that taste just like eating a ripe kiwi, and hopefully you’ll have a chance to try it out before the summer is over!
When my box of kiwis from the wholesale club decided to all ripen at the same time, my gut instinct was to make kiwi cupcakes. But having never done it before, and given that kiwis have quite a bit of moisture to them, I looked to the internet for guidance. As it turns out, not too many people have done straight up kiwi cupcakes with kiwi frosting. Almost all the posts I saw were strawberry kiwi cupcakes, which sounded great, but I didn’t have any strawberry. I ultimately ended up combining two recipes: a strawberry cupcake base that substitutes kiwi for the strawberry, and a delicious-looking kiwi buttercream recipe that uses the surprising ingredient salt for a great kiwi flavor. It was important to me that the kiwi flavor would come through in both the cupcake base and the frosting, and I loved the idea of having flecks of the jewel green kiwi fruit and black seeds throughout.
I also recently purchased a set of fluted silicone cupcake liners, in the hopes that I would be to save money on cupcake liners when I’m baking for myself or small parties, since I never seem to have cupcake liners on hand when I want to use them. The interesting part was being able to pop out the finished cupcakes from the silicone cups without needing to grease them, they came out like magic! I also liked the smooth fluted sides of the cupcakes that looked so neat and clean compared to the crumbs and mess that comes with peeling back a paper liner.
Unfortunately, the lesson learned is that silicone is neither good for heat retention nor heat conduction, so my cupcakes took WAY longer to bake than they should and ended up getting very browned on the tops and bottoms before the inside was even cooked through. When they were finally done, the taste was still wonderful, just the tops were a bit over-done with all that extra time. The silicone was a huge disappointment, so I think I will go back to using regular paper liners. Alas, we were not meant to be. I suppose I’ll hide the silicone liners away until I find another use for them that doesn’t involve heat and baking. I bet they’ll be good as molds for things like gelatins, mousses, and no-bake cheesecakes.
Kiwi Vanilla Cupcakes with Kiwi Buttercream Frosting (makes 1 dozen)
- 1-2 whole fresh kiwis (enough to make 1/3 cup of mashed kiwi)
- 1 1/2 cups all-purpose flour
- 1 tsp baking powder
- 1/4 tsp sea salt
- 1/4 cup milk
- 1 tsp vanilla extract
- 1/2 cup (1 stick) unsalted butter, room temperature
- slightly over 3/4 cup granulated sugar
- 1 egg
- 2 egg whites
- 1 whole fresh kiwi, mashed
- 1/2 cup (1 stick) unsalted butter, room temperature
- 1/2 tsp vanilla extract
- slightly over 3/4 cup confectioner’s sugar
- a pinch or two of sea salt
1. Preheat oven to 350 degrees F. Line a 12-cup muffin tin with cupcake liners (I do NOT recommend using silicone liners).
2. Peel the 3 kiwis you will need for the cupcakes and frosting, and mash them well using a fork, trying to break up large chunks. See the consistency of the mashed kiwi below for reference. If your kiwi is not soft enough to mash with a fork, puree it in a food processor or blender. You will use 1/3 cup of the mashed kiwi for the cupcakes, and the remainder can be set aside for the frosting.
3. In a medium bowl, mix together the flour, baking powder, and salt for the cupcake base. In another small bowl, mix together the milk, vanilla, and the 1/3 cup mashed kiwi.
4. In a large bowl, cream the 1 stick of butter with an electric mixer on medium-high speed until light and fluffy, then add sugar and continue beating until fluffy. Turn down the speed to medium and blend in egg and egg whites until just blended.
5. Turn mixer to low speed and add half the flour mixer, mixing briefly until just blended. Then add the milk and kiwi mixture, blend briefly until just combined. Finally add remaining half of the flour mixture, scrape down sides of bowl, and finish mixing just until blended.
6. Divide batter evenly among muffin cups, and bake for 22-25 minutes until tops are golden and just dry to the touch, and a toothpick inserted comes out clean. (If you so happen to be using silicone muffin cup liners, you may need to add an extra 10-15 minutes of bake time on top of this.) Remove from oven and cool thoroughly before frosting. If using silicone liners, remove them as soon as the cupcakes have cooled just enough to handle.
7. Make the frosting: Cream butter until light and fluffy. Add approx 3-5 tbsp of mashed kiwi to the butter, 1 tablespoon at a time, and blend well. You can always add more kiwi but you can’t take it back once it’s in there. Just make sure the mixture is still light and fluffy and doesn’t become watery. Now add vanilla and confectioner’s sugar, and blend thoroughly. Stop to taste the frosting, making note of the degree of sour versus sweet. The final step is to add the salt and mix well, and taste again.
The frosting flavor should really round out and come together at the end, without being too sweet or too sour. You won’t taste the salt, but it will balance out the kiwi and the sugar so that the uniqueness of the kiwi flavor shines through. I swear the frosting tastes so addictive and refreshing, like a perfectly ripe kiwi, mmm!
These cupcakes are best the day of, and look beautifully summery when garnished with slices of kiwi. The frosting comes out a very pale pastel green, with flecks of the black kiwi seeds throughout. You’ll find the kiwi pairs surprisingly well with the buttery vanilla in the cupcake, brightened up by the bold kiwi flavor in the frosting. I couldn’t believe how fresh of a taste it was, considering how rare it is to hear about kiwi cupcakes as a concept. Everyone who had one of these asked for a second, which must be a good sign right? ;) I know I’ll be making these again and again when I have all those extra kiwis in the summertime!