You are going to totally, completely LOVE this cake and it's simple. If you've never had Kahlua, it's a coffee liqueur and it's what gives this cake a distinctly different flavor than your old run-of-the-mill chocolate cake. Also, this is the most moist cake I've ever made. Wonderful.
1 yellow cake mix
1 3.9 ounce package chocolate fudge instant pudding
1 cup water
1 cup vegetable oil
1/2 cup Kahlua
Preheat oven to 350 degrees.
Combine all ingredients in a large mixing bowl. Mix for one minute to combine. Scrape down sides of bowl and mix another minute (on high speed).
Grease or spray bundt (or tube) pan and lightly dust with flour. Pour batter evenly into pan and bake for exactly 38 minutes.
Let cake cool for 10 minutes. Invert onto rack to cool completely.