Mixed Berry Crumb Cake

Name: Mixed Berry Crumb Cake
Ingredients: 3/4 cup all-purpose flour; 1/2 cup light brown sugar; 1/4 teaspoon kosher salt; 6 tablespoons unsalted butter, at room temperature; Nonstick cooking spray, for the pan; 2 cups mixed fresh berries (blueberries, raspberries, blackberries); 1 3/4 cups (228 grams) plus 1 tablespoon all-purpose flour; 1 1/2 teaspoons baking powder; 1 teaspoon ground cinnamon; 1/2 teaspoon baking soda; 1/2 teaspoon kosher salt; 1 cup (200 grams) granulated sugar; 1/2 cup (1 stick) unsalted butter, at room temperature; 1/4 cup unrefined coconut oil, at room temperature; Zest of 1/2 lemon; 1 large egg plus 1 yolk; 2 teaspoons vanilla extract; 1/2 cup full-fat sour cream; Crushed freeze-dried strawberries, for topping