Step 1

In a small bowl, use a whisk to stir together flour, baking powder, and salt.

Step 2

Use a handheld or stand mixer to beat the butter and sugar on medium speed until light and airy, for about 3 minutes.  Do not use high speed.  Periodically scrape the sides of the bowl using a silicone spatula.

Step 3

Beat in the egg on medium speed until just combined. Don't overmix.

Step 4

Beat in vanilla until just incorporated.

Step 5

Use a sieve or flour sifter to sift in half the flour mixture.

Step 6

Beat until just combined. Don’t overmix!

Step 7

Beat in the sour cream until just combined.

Step 8

Add the remaining flour mixture and mix to combine.  Scrape the sides and bottom of the bowl periodically.

Step 9

Generously grease and flour a 7-inch cake pan.

Step 10

Pour the batter into the prepared cake pan. Use a spatula to gently even out the batter.

Step 11

Place a trivet in inner pot and place the cake pan on the trivet.

Step 12

Close the air fryer lid and select Bake (or Air Fry) and set it at 350 degrees for 35 minutes.

Step 13

Once the time is up, place the air fryer lid on the cooling mat and test the cake for doneness with a toothpick. If the toothpick comes out wet or has crumbs on it, bake for another 3 to 5 minutes.

Step 14

Transfer the cake from the Instant Pot onto a cooling rack and allow to cool for 15 minutes.

Step 15

Turn the cake out onto a cake rack and allow it to cool completely.

Step 16

Right before you’re ready to glaze the cake, stir together confectioners sugar, milk and vanilla (if using) in a small bowl, to create a smooth glaze that's the consistency of maple syrup. Add more or less milk to get the right consistency.

Step 17

Place the cake on a plate and drizzle the glaze over the top. The glaze will harden at room temperature.

Step 18

Double all ingredients.

Step 19

Use a bundt cake pan or loaf pan.

Step 20

Preheat the oven to 350 degrees Fahrenheit.

Step 21

Bake for 55 minutes to one hour or until a toothpick comes out clean.