Coffee Cake
Preheat Oven to 350°F
Prepare baking pan. If using springform, make sure to use a brush and coat with nonstick spray on the interior of pan rim.
Zest orange and set the zest aside.
Slice zested orange VERY thin
In bottom of preared springform,sprinkle to coat base, a tablespoon of sugar and then place orange pieces on the bottom atop the sprinkled sugar. Set aside
In small mixing bowl, place flour, baking soda and powder. Set aside.
Using a large mixing bowl place eggs, butter, brown sugar, white sugar, sour cream, and vanilla extract. Mix to combine well.
Once combined add in flour mixture. Combine again. Make sure to scrape down sides to incorporate all ingredients evenly.
Add in 3/4 of the orange zest. Mix to combine.
Now fold in the walnuts.
Set coffee cake mixture aside and now make the struesel