Warm apples in a sweet cake with cinnamon butter sauce? Perfect fall dessert.
Meanwhile in a saucepan, heat sauce ingredients over medium heat, stirring frequently, until butter is melted and sauce is hot. Remove from heat and stir in vanilla. Serve a drizzle of warm sauce over warm cake. There's enough sauce for even a double batch.
Tips: You can bake the cake and make the sauce a day ahead and store them separately (refrigerate sauce). Warm the sauce in a saucepan over low heat, and heat individual pieces of cake uncovered in the microwave on High for 25 to 35 seconds or until warm.