Almond Snacking Cake with Berries

Name: Almond Snacking Cake with Berries
Ingredients: 12 Tbs. (1 1/2 sticks) (6 oz./185 g) unsalted butter, at room temperature, plus more for the pan; 2 cups (6 3/4 oz./192 g) superfine almond flour; 1/3 cup (1.4 oz./40 g) all-purpose flour; 1 tsp. baking powder; 1 tsp. kosher salt; 1 cup (7 oz./198 g) granulated sugar; 3 eggs, at room temperature; 2 Tbs. grated lemon zest; 1 Tbs. fresh lemon juice; 2 tsp. vanilla extract; 1 cup (4 oz./125 g) blueberries and/or blackberries, plus more for serving; Confectioners’ sugar for dusting (optional); Whipped crème fraîche, whipped cream or ice cream for serving