A very nice coffee cake. I did adjust it by using chopped almonds in place of the walnuts for the topping. I used plain yogurt in place of the buttermilk also as you stated as an alternative. I really liked the flavors with the wheat flour and the blueberries (used fresh). Thanks for sharing! Made for a tag in the I Recommend Tag Game based on Marz's review!
Yum! This was a very good cofee cake, though I did half the recipe and made them into muffins. I got 8 regular sized muffins. I also used ground hazelnut for the topping and it came out great! The sweetness level was right on and I loved the low amount of fat (oil). Thanks for sharing, Glaucia!!