So bad, yet so, so good

I few weeks ago at work I was food-blog stalking and found this marvelous recipe. I got it from Culinary Infatuation who got it from Cara's Cravings who got it from Epicurious. It was very good, super sweet but it really hit the spot.

Banana Coffee Cake with Chocolate Chip Streusel

1 1/4 cups semisweet chocolate chips
2/3 cup (packed) golden brown sugar
1/2 cup chopped walnuts
1 tablespoon ground cinnamon
1 1/2 cups all purpose flour
3/4 teaspoon baking soda
3/4 teaspoon baking
1/4 teaspoon salt
3/4 cup sugar
1 stick unsalted room temperature butter
1 large egg
1 1/3 cups (about 3 large) mashed very ripe bananas
3 tablespoons buttermilk

Preheat oven to 350°F. Butter and flour 8x8x2-inch metal baking pan. Stir chocolate chips, brown sugar, walnuts, and cinnamon in small bowl until well blended; set streusel aside. Sift all purpose flour, baking soda, baking powder, and salt into medium bowl. Using electric mixer, beat sugar, room temperature butter, and egg in large bowl until fluffy. Beat in mashed bananas and buttermilk. Add dry ingredients and blend well

Spread half of batter (about 2 cups) in prepared baking pan. Sprinkle with half of streusel. Repeat with remaining batter and streusel. Bake coffee cake until tester inserted into center comes out clean, about 45 minutes. Cool coffee cake in pan on rack.

I couldn't find my metal pan, so I used a glass one. Also, the recipe I printed off some how managed not to have the 3 tbsp of buttermilk on it. So I used the whole little container of buttermilk. It turned out good, just had to cook it longer. The cake is super moist. I also added more chocolate chips to the top. That is totally not necessary. It's sweet enough without the extra chocolate.