1/2 cup (1 stick) butter, room temperature
1 cup plus 3 tablespoons light-brown sugar
1 tablespoon grated lemon zest
1 teaspoon pure vanilla extract
1 large egg
2 1/4 cups all-purpose flour
3/4 teaspoon baking powder
1/4 teaspoon baking soda
1/2 teaspoon coarse salt
1 cup whole milk
3/4 cup heavy cream
1 cup fresh raspberries (4 ounces)
Preheat oven to 350. In a large bowl, using an electric mixer, beat butter, 1 cup brown sugar, and lemon zest until light and creamy. Add vanilla and egg and beat to combine, scraping down bowl as needed. In a medium bowl, whisk together flour, baking powder, baking soda, and salt. With mixer on low, beat in flour mixture in 3 additions, alternating with milk and ending with flour mixture (scrape bowl as needed). Beat well to combine.
Drop batter in 2-tablespoon mounds, about 2 inches apart, onto two parchment-lined baking sheets. Bake until puffed and pale golden around edges, 17 to 19 minutes, rotating sheets halfway through. Let cakes cool completely on sheets on wire racks.
In a large bowl, whip cream and 3 tablespoons brown sugar to soft peaks. In a small bowl, mash raspberries with a fork, then fold into whipped cream. Divide raspberry cream evenly among bottoms of half the cakes, then sandwich with remaining cakes.
Recipe shared from: http://www.marthastewart.com/318802/raspberry-lemon-whoopie-pies?czone=holiday/sixty-days-of-summer/recipes-ideas¢er=276964&gallery=274895&slide=233456