Home for the weekend- Nectarine and blueberry coffee cake

Mom found this recipe at this blog
She really loves this blog, looks like I'll be giving it a look through soon. The store's peaches were only okie dokie, so we went with nectarines.

Here's our non gluten free version of it:
1 1/2 cups All-purpose flour
1 cup sugar
2 tsp baking powder
1/2 tsp baking soda
1/4 tsp salt
2 eggs
1 cup sour cream
1/2 tsp vanilla extract
1/2 cup fresh blueberries
2 fresh nectarines sliced thin

Topping:
4 tbsp sugar
2 tbsp soft butter
1/2 tsp cinnamon
1 tsp flour

Mix dry ingredients together. In a separate bowl mix sour cream, eggs and vanilla. Pour wet ingredients into dry ingredients.  Mix until smooth. Pour into a buttered pie pan. Place nectarines and blueberries over. Mix topping ingredients until paste like. Place in a 350F oven. Bake for 40 mins, or until toothpick comes out clean.