Geoffrey Zakarian Recipes | Viola's Coffee Cake

Ingredients

• Nonstick cooking spray, for the pan
• 1 cup chopped walnuts
• 1/4 cup sugar
• 1 teaspoon ground cinnamon
• 1/2 cup (1 stick) unsalted butter, at room temperature
• 1 1/2 cups sugar
• 2 large eggs, at room temperature
• 1 teaspoon vanilla paste
• 1 cup sour cream, at room temperature, plus additional for serving
• 2 cups all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon baking soda
• 1/4 teaspoon kosher salt