Taken from Southern Living Magazine, this recipe caught my eye and with a sack of blackberries already in the fridge, it sounded too good not to try. It is also one of those rare moments when I have almond flour in the house, which I had purchased to make another batch of french macaroons.
1 1/2 cups (12 oz) unsalted butter, plus more for the pan
8 large egg whites
3 1/4 cups unsifted powdered sugar, plus more for dusing
1 1/2 cups almond flour
1 cup plus 1 tables all purpose flour, divided, plus more for pan
1 tables vanilla bean paste
1 1/2 cup fresh blackberries
Preheat oven to 325. Grease and flour a 12 ” round tart pan with removable bottom; place tart pan on a rimmed baking sheet lined with parchment paper. Melt butter in a saucepan over medium-high and cook, stirring often, until butter releases a nutty aroma and milk solids are golden brown, about 8 minutes. Immediately transfer butter to a bowl; ;cool slightly, about 10 minutes.
Beat egg whites with a heavy duty electric mixer on medium speed until frothy, about 30 seconds. Gradually add powdered sugar; beat until light and fluffy. Gradually add almond flour and 1 cup of the all purpose flour; beat on medium low speed until incorporated. Add vanilla bean paste (if you don’t have vanilla paste, add 2 teas vanilla) and browned butter. Beat on medium-low speed until incorporated. Spread batter in prepared pan. Toss blackberries with remaining 1 tablespoon all purpose flour and sprinkle over the batter.
Bake in preheated oven until golden brown and a wooden pick inserted in center comes out clean, 42-45 minutes. Cool in pan on a wire rack 15 minutes. Remove sides of pan and cool 30 more minutes. Dust with powdered sugar before serving.