Make the Apple Filling & Topping. Add all filling ingredients except the corn starch & water to a medium saucepan over medium high heat. Cook over medium high heat, stirring, for about 8-12 minutes – or until the apples are tender to your liking. Stir together cornstarch and water in a small bowl until dissolved, and stir into the apples while still over medium high heat. Cook for 1 minute or so until the juices thicken up. Remove from heat and pop in the fridge to cool.
5 large honeycrisp apples, peeled and diced, 2 tbsp salted butter, 1/3 cup brown sugar, packed, 1 and 3/4 tsp cinnamon, 1/2 tsp nutmeg, 1/4 tsp allspice, 1/4 tsp ground cloves, 1 tbsp boiled cider or apple cider, 1 tsp corn starch, 1 tsp water
Prep: Preheat your oven to 350° F. Line two cupcake pans with paper liners, in preparation for 16-17 cupcakes.
Start the Batter: In a medium mixing bowl, whisk together the flour, sugars, baking powder, cinnamon, and salt. Add the softened butter and oil, and mix on low speed for about 30-60 seconds, just until the butter starts incorporating and you have a sandy mixture with some drier sandy bits, and some unevenly incorporated chunks of butter coated in flour.
1 and 1/2 cups + 1 tbsp cake flour, spooned & leveled or weighed out , 1 cup granulated sugar, 3 tbsp light brown sugar, packed, 1 and 1/2 tsp baking powder, 1/8 tsp salt, 1 tsp cinnamon, 7 tbsp salted butter, softened at room temperature , 2 tbsp vegetable oil
Finish the Batter: In a 2-cup glass measuring cup, whisk together the sour cream, milk, water, and vinegar until combined. Add 2 tbsp of this mixture to the bowl of butter and flour. Mix on low speed just until the mixture starts to come together (no more dry bits!), but is still lumpy. (See photos in blog post above for a visual). Then, add the vanilla and eggs to the remaining liquid mixture, lightly beating the eggs with a fork to break them up. Pour half this mixture into the bowl of batter with your mixer running on low. When it's almost incorporated, pour in the remaining liquid, mixing on low until just combined. Scrape the bowl to make sure everything is mixed in - a few small lumps is fine! Do not overmix. 1/3 cup + 1 tbsp milk, at room temperature, 1/2 cup full-fat sour cream, at room temperature, 1 tbsp warm water, 1/2 tsp vinegar, 1 tbsp vanilla bean paste, 2 large eggs, at room temperature
Bake: Divide the batter evenly among your 16-17 cupcake papers. Fill them about 2/3 full, or use 52 grams of batter per cupcake (I like precision!). Bake for 14 to 17 minutes. A toothpick inserted into the center should pull out moist crumbs, not wet batter. Immediately use a butter knife to pop the cupcakes out of the hot pan, and place them on a wire rack to cool completely. Make the Frosting: While the cupcakes cool, make the frosting. In a medium bowl, beat the butter until creamy, 30-60 seconds. Add the powdered sugar and mix until combined, using the heavy cream as needed to help things along. Mix in the remaining frosting ingredients, adjusting to taste. If for some reason your frosting is too soft or weepy, pop the bowl in the fridge or freezer to stiffen it back up. 1/2 cup + 2 tbsp salted butter, softened at room temperature , 3 and 1/2 cups to 4 cups powdered sugar, 2-4 tbsp boiled apple cider, 2 tbsp heavy cream, 1 tbsp vanilla bean paste, pinch of salt, to taste, 1/4 tsp cinnamon
Decorate: Make sure your cupcakes are completely cooled. Use a cupcake corer or a teaspoon to core each cupcake. Add 1-2 tsp of apple filling into each cupcake. Fill a piping bag fitted with an Ateco 1A tip, then pipe swirls of frosting onto the cupcakes. Use the back of an offset spatula or spoon to create a swirl in the center of the top of the frosting. Add another spoonful of apple filling on top and drizzle with the juices from the apple filling.
Serve + Store: Dig in immediately once the cupcakes are frosted! Store in an airtight container in the fridge for 2-3 days. Let cold cupcakes come back to room temperature on the counter before enjoying (or eat them cold, if you like a denser texture!)
Freezing Instructions: These cupcakes freeze well without the filling and frosting. Let thaw on your counter for 1-2 hours before filling & frosting.