1.
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Preheat oven to 350 degrees. Grease and flour a tube pan with a removable bottom. |
2.
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For the cake: Using a standing mixer with the paddle attachment, cream the butter and granulated sugar until very light and fluffy. Add the eggs and beat well. Add the yogurt, bananas and vanilla and beat until combined. Add the flour, baking soda and salt and mix until just combined. (do not over mix after you add the dry ingredients) |
3.
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Make the Swirl and Topping mixture. In a small bowl, stir together the flour, brown sugar, cinnamon and salt. Take 6 tablespoons of the cold butter and grate it into the flour/sugar mixture, using a large hole grater. Reserve the remaining 2 tablespoons of butter (to add later) Use your fingers to rub the grated butter into the dry mixture until you have a crumbly dry consistency. |
4.
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Spoon half of the batter into the prepared tube pan, smoothing the top with a spatula. Sprinkle half of the Swirl and Topping mixture over the batter in the pan. Now add the rest of the cake batter to the pan and once again, smooth it gently to cover the swirl and even out the surface. Melt the 2 tablespoons of butter that you reserved from earlier and pour it into the remaining cinnamon swirl mixture. Stir with a fork to moisten all of the crumbs. Use your fingers help the mixture clump together then sprinkle them on the top of the cake batter, a thick layer covering the entire surface. |
5.
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Bake 1 hour, or until cake is golden around the edges and cake tester, or long wooden skewer, comes out clean ( crumbs attached is fineā¦just no wet batter) Let cool 30 minutes before removing coffee cake from pan. |