4 hazelnut upside down cake Recipes

unsalted butter, softened, plus extra for greasing the pan, brown sugar, pure maple syrup, crisp apples , such as granny smith, peeled, cored and cut into 1/2- to 1-inch cubes, coarsely chopped hazelnuts or 1/2 cup almonds, fresh lemon juice, ground cardamom or 1/2 tsp cinnamon, salt, all-purpose flour, baking powder, granulated sugar, eggs, at room temperature, pure vanilla extract, buttermilk

dark brown sugar, unsalted butter, water, toasted assorted unsalted nuts (toasted, skinned and chopped hazelnuts, slivered almonds, or walnuts are good), flour, unsweetened cocoa powder, baking powder, baking soda, salt, unsalted butter, at room temperature, sugar, vanilla, eggs, buttermilk

unsalted butter, melted, light brown sugar, hazelnut-flavored liqueur (frangelico), peach slices, drained and juice reserved, chopped hazelnuts, white cake mix, unsalted butter, melted, sour cream, egg whites, hazelnut-flavored liqueur