Chocolate Fudge Cupcakes filled with Chocolate Fudge Cookie Bar and Marshmallow Meringue Frosting

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1 3/4 cups all-purpose flour

1 3/4 cups sugar

3/4 cups high-fat cocoa powder

2 teaspoons baking soda

1 teaspoon baking powder

1 teaspoon kosher salt

1 cup buttermilk, shaken

1/2 cup vegetable oil

2 extra-large eggs, room temperature

1 1/2 teaspoon vanilla extract

1/2 cup freshly brewed strong, hot, coffee

1/2 cup hot water

Chocolate Fudge Cookie Bar, recipe follows

Marshmallow Meringue Frosting, recipe follows

Chocolate Fudge Cookie Bar:

2 1/2 cups chocolate sandwich wafer cookies, finely ground

6 tablespoons unsalted butter, melted

1/8 teaspoon salt

2 cups semisweet chocolate chips

1/2 (14-ounce) can condensed milk

Marshmallow Meringue Frosting:

1 3/4 cups sugar

1/4 cup water

3 large egg whites

1/4 teaspoon cream of tartar

1 1/2 teaspoons vanilla extract