Preheat your oven to 350℉/175℃ and line a cupcake pan with liners. Set aside.
In a bowl, whisk the flour, baking powder, baking soda, salt, cinnamon and pumpkin pie spice. Set aside.
1 cup all-purpose flour, 1 teaspoon baking powder, ½ teaspoon baking soda , 1 teaspoon kosher salt, 2 teaspoons ground cinnamon, 2 teaspoons pumpkin pie spice
In a large bowl, whisk together the brown sugar, granulated sugar, canned pumpkin, vanilla extract, eggs, and oil.
½ cup neutral oil , 2 large eggs , ½ cup light brown sugar, ½ cup granulated sugar, 1 cup pumpkin puree, 2 teaspoons vanilla extract
Pour the dry ingredients into wet ingredients and mix until just combined with a rubber spatula.
Fill up the cupcake liners so they're about ⅔ full - you don't want them to overflow in the oven! Bake in the oven for 20-24 minutes, or until a toothpick inserted comes out clean.
Let cool in the pan for 5-10 minutes before removing from the cupcake pan and cooling completely on a wire cooling rack.
Marshmallow Frosting
Place the egg whites, sugar, salt, and cream of tartar in a heatproof bowl - I prefer using a metal bowl for this.
4 large egg whites, ¾ cup granulated sugar, ½ teaspoon cream of tartar, pinch salt
Fill a saucepan with an inch or two of water on the stove and place over medium-low heat, so the water begins to simmer. Place the bowl on top of the saucepan, making sure the bottom of the bowl doesn't touch the water.
Whisk constantly until the sugar dissolves. It'll go from thick to frothy. To test, I like to (carefully!) lift the whisk up and rub the mixture between my fingers. You shouldn't feel any of the sugar.
Take the bowl off the double boiler and place in your stand mixer, fitted with the whisk attachment (or use a handheld mixer). Add the vanilla.
1 teaspoon vanilla
Beat on high speed for 5 minutes, or until you get stiff and glossy peaks.
Frost your cupcakes with the marshmallow frosting. Optional, but use a kitchen torch to toast the frosting and enjoy!
Video
Notes
My recipes have been developed and tested in metric grams. I highly recommend using a weighing scale and measuring out your ingredients the metric way. I have provided a conversion to US cups but please note that I haven’t tested the recipe with this method. Just click on ‘US Customary’ above the ingredients to see the cup measurements.
I make sure that all of my ingredients are at room temperature before I start the recipe, so pull out all of the ingredients before you start baking
Pumpkin: you want to use 100% pure pumpkin puree in a can, and not pumpkin pie filling.
Salt: If you don’t have kosher salt, halve the amount of salt called for in the recipe. 1 teaspoon kosher salt = ½ teaspoon fine salt.
Vegetable Oil: Use an unflavoured oil like canola oil if you don’t have vegetable oil.
Blow Torch: If you don't have a blow torch, you can either enjoy the frosting untoasted (it tastes like marshmallow fluff!) or you can use your broiler. I place the cupcakes on a baking sheet under the broiler and keep a very close eye on them - it can go from toasty to burnt quickly. Note, the color from the broiler isn't as nice looking and looks a bit grey versus the brown, toasty color you get from a blow torch.
Storage: Keep in an airtight container in the fridge for up to 5 days. Let it come to room temperature before eating.