Buttermilk Raspberry Crumb Cake

I made a raspberry crumb cake tonight and it turned out really really good.  It taste even better when you put a little of whipped butter on it after it just came out of the oven.  :D  

Serves 6-8

½ cup unsalted butter, room temperature
2 tsp. lemon zest or more — zest from 1 large lemon
7/8 cup + 1 tablespoon sugar
1 egg, room temperature
1 tsp. vanilla
2 cups flour
2 tsp. baking powder
1 tsp. kosher salt
2 cups fresh raspberries
½ cup buttermilk

1. Preheat the oven to 350ºF. Cream butter with lemon zest and 7/8 cup of the sugar until light and fluffy.

2. Add the egg and vanilla and beat until combined. Meanwhile, toss the raspberries with ¼ cup of flour, then whisk together the remaining flour, baking powder and salt.

3. Add the flour mixture to the batter a little at a time, alternating with the buttermilk. Fold in the raspberries.

4. Grease a 9-inch square baking pan (or something similar) with butter or coat with non-stick spray. Spread batter into pan. Sprinkle batter with remaining tablespoon of sugar. Bake for 35 minutes. Check with a toothpick for doneness. If necessary, return pan to oven for a couple of more minutes. (Note: Baking for as long as 10 minutes more might be necessary.) Let cool at least 15 minutes before serving.

                                                                  Right out of the oven!           
                                      

                                                              Ready to go into the oven

                                                                   Mixing the raspberries