1 box yellow cake mix ¼ cup (57 g) unsalted butter, melted 1 cup (198 g) light or dark brown sugar 1 tablespoon ground cinnamon 1 cup (114 g) finely chopped pecans 3 eggs 1½ cups (340 g) sour cream Preheat oven to 350 degrees F. Grease a 9-inch square baking pan; set…