Vanilla Cake with Buttercream Frosting

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Vanilla Cake:

Nonstick cooking spray, for greasing the pans

3 cups all-purpose flour, plus 1/4 cup for dusting the pans 

1 tablespoon baking powder 

1/2 teaspoon salt 

2 sticks unsalted butter, at room temperature

1 1/4 cups granulated sugar 

4 large eggs, at room temperature 

1 tablespoon vanilla extract 

1 1/4 cups whole milk (or 3/4 cup heavy cream mixed with 1/2 cup water) 

Buttercream:

4 cups confectioners' sugar

1 cup (2 sticks) unsalted butter 

2 teaspoons vanilla extract 

1 to 2 tablespoons whipping cream, plus additional if needed