Begin cake by making cream cheese swirl:

Beat butter with cream cheese and sugar until smooth in your mixing bowl or stand mixer. Add egg and vanilla and beat until incorporated.  Remove to another bowl, scraping out as much as possible, and scraping beaters.  You will be using this same bowl for the cake.

Using the same bowl, combine cake mix with liquids, melted butter and eggs.  Beat according to cake mix directions.  Put 1 cup of batter into another clean mixing bowl and combine with cocoa mix as per box directions.  Stir the white or chocolate chips into the bowl of plain batter.

Grease your bundt pan thoroughly with cooking or baking spray, or use butter with a dusting of flour.  Place 1/2 of plain batter in pan.  Top with chocolate batter.  Place cream cheese swirl on top of chocolate batter, trying to keep it away from the sides of pan and more in the center of batters.  Top with remaining plain batter.  Bake cake for 30 minutes at 350 degrees.  Check with cake tester.  The center with the cream cheese layer will be runny.  Remove when cake part tests done, 30-40 minutes depending on your oven.  Don’t worry if the cream layer is still liquid like it will set up upon cooling.  Let cake cool completely in pan before turning out onto a plate.  Refrigerate cake.

Melt sugar in small saucepan over medium heat, stirring and watching closely.  After several minutes sugar will begin to melt and clump.  Keep stirring until it is completely melted and starting to darken.  Slowly pour in about 1/3 of the butter.  It will bubble, keeping stirring as you add the rest,  and turn burner way down. If mixture starts to thicken too quickly remove pan from heat.  Add Kahlua and continue to stir vigorously to combine for another minute or so.  Remove from heat and stir in salt.  Let cool for 30-45 minutes before glazing cake.  Can be refrigerated and then rewarmed.

Poke cooled cake with skewer or fork and slowly pour glaze over the top, letting the glaze run down the sides.

Store cake covered in the refrigerator.  Let cake return to room temperature before serving for best flavor.