Apple-Peanut Butter Cupcakes

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Cupcakes:

2 1/4 cups all-purpose flour (see Cook's Note)

1 teaspoon baking soda

1/2 teaspoon fine salt

1/4 teaspoon ground cinnamon

1/4 teaspoon nutmeg

2 sticks (16 tablespoons) unsalted butter, at room temperature

1 cup granulated sugar

3 large eggs

1 tablespoon pure vanilla extract

1/2 cup sour cream

1 large crisp sweet apple, such as Gala, peeled, cored, and finely chopped (about 1 cup)

Frosting:

2 cups creamy peanut butter

Two 8-ounce packages cream cheese, at room temperature

1 stick (8 tablespoons) unsalted butter, softened

3 cups confectioners' sugar