Strawberry Shortcake Cupcakes

Name: Strawberry Shortcake Cupcakes
Ingredients: 1 ½ cups all-purpose flour, plus 2 tablespoons; 1 ½ teaspoons baking powder; 1 teaspoon coarse salt; 1 cup (2 sticks) unsalted butter, room temperature; 1 cup plus 2 tablespoons granulated sugar; 4 large eggs, room temperature; ½ teaspoon pure vanilla extract; 6 tablespoons sour cream, room temperature; 2 tablespoons good-quality strawberry jam; 12 ounces strawberries, finely chopped, plus more thinly sliced, for topping; Lightly sweetened whipped cream, for topping