Crumb Coffeecake

When it is Sunday morning and the sun is out, one must sit on the porch and eat coffeecake. Batter: 1/2 c. unsalted butter, softened 8 oz. homemade creme fraiche 1 1/4 c. sugar 2 eggs 2 cups AP flour 2 tsp. baking powder 1/2 tsp. salt 1/2 tsp. baking soda 1/2 cup whole milk 1…