Jelly-Filled Cupcakes With Peanut Butter Frosting

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Baking spray with flour

1 1/2 cups all-purpose flour

1 teaspoon baking powder

1/2 teaspoon fine salt

1 stick (4 ounces) unsalted butter, at room temperature

1 cup granulated sugar

2 large eggs plus 1 egg yolk

2 teaspoons pure vanilla extract

3/4 cup milk

1 cup grape jelly

Peanut Butter Frosting, recipe follows

Candy bars, crushed with a rolling pin, such as Reese's Pieces, Butterfinger, Nutter Butter, Heath Bar, or small sandwich cookies, for decorating

Peanut Butter Frosting:

1/2 cup smooth peanut butter

4 tablespoons unsalted butter, at room temperature

4 ounces cream cheese, at room temperature

2 cups confectioners' sugar

1 1/2 teaspoons milk