1 box (15.25-ounce) cake mix, divided (yellow, butter, or vanilla)
2 rounded teaspoons ground cinnamon
1/3 cup packed brown sugar
4 large eggs
1 1/4 cups buttermilk
1/2 cup melted unsalted butter
1 cup chopped pecans
For the Glaze
1 cup powdered sugar
2 tablespoons milk
Instructions
Heat the oven to 375 F. Generously grease and flour a 12-cup Bundt cake pan or spray it with nonstick spray and dust with flour.
Put 2 tablespoons of the cake mix in a small bowl; add the brown sugar, cinnamon, and chopped pecans. Set aside.
Put the remaining cake mix in a mixing bowl. Add the buttermilk, vegetable oil, and eggs.
Beat with an electric mixer on medium speed until smooth and well blended.
Spoon half of the batter into the prepared pan; smooth it then sprinkle the reserved pecan mixture evenly over the layer.
Top with the remaining cake batter and gently spread to cover. Tap the pan on the counter to release any trapped air.
Bake the cake until it is set and a skewer inserted into the center of the cake comes out clean, about 50 to 60 minutes.
Remove the cake from the oven and let it cool in the pan for 10 minutes.
Carefully invert it onto a rack that is set over a sheet of foil or baking sheet. Let it cool while you make the glaze.
For the glaze, sift the confectioners’ sugar into a medium bowl; add 1 1/2 teaspoons of vanilla and 2 teaspoons of milk; mix, adding more milk if too thick to drizzle.