tub of mascapone cheese (which serves 2-3 depending on your portion size). Mascapone is slightly sweet but low in carbs, once you have this basic ingredient the world is the mollusc of your choice...
mix in 1-2 teaspoons (dissolved in a little water) good quality instant coffee and a little sweetener. chill before serving
mix in a couple of squares of melted high quality 70% plus chocolate
both the above can also benefit from a couple of drops of vanilla or other essence
the zest of a lemon and line, some lemon essence and 1/2 a squeezed lemon or lime, sweetener to taste
pulp some berries and mix, sweetener to taste
Deliciously rich and indulgent and very sophisticated
It hits that cheesecake spot and is very flexible.
Next time I buy mascapone I plan to experiement with some fresh ginger and chocolate, this has always been one of my favorite combinations.