Sift the flour, baking powder, salt, and sugar. Cut in butter until the mixture has the consistency of coarse meal or small peas . Reserve about 1 ½ cups of this mixture. Combine the eggs, milk, and vanilla extract and stir into the remainder of the dry blend just until everything is moistened. Pour into 2 well-buttered 10-inch pie pans. Brush the top of the dough with melted butter and sprinkle with the reserved crumb mixture. Bake in a 350°oven for 25 to 30 minutes, or until cake is done or a toothpick comes out clean.
Recipe by Amish 365 at https://www.amish365.com/amish-crumb-cake-2/