Preheat oven to 350°. Combine raspberries and brown sugar in a bowl.
Combine flour, sugar, baking powder, baking soda, and salt in a large bowl.
Combine yogurt, butter, tsp vanilla, and 1 egg in small bowl; stir well. Add to flour mixture, stirring just until moist.
Spoon 2/3 of batter into an 8-inch round cake pan sprayed with cooking spray. Spread evenly. Top with raspberry/brown sugar mixture. Drop remaining batter over raspberry mixture with a spoon. (You may not have enough to fully cover the pan. Don't worry; the spacing adds craters that will catch the glaze!) Top with sliced almonds.
Bake at 350° for 40 minutes or until toothpick inserted into center comes out clean. Let cool 10 minutes on wire rack.
Combine powdered sugar, milk, and tsp of vanilla. Stir well. Drizzle glaze over coffeecake.