Chocolate Mousse

Ingredients:

Semi-Sweet Chocolate Chips – 1 cup
Butter – 1 Tbsp
Hot Water – 2 Tbsp
Instant Coffee Powder – 2 tsp
Eggs – 2 large (separated into yolks and whites)
Sugar – 1 tsp (to be mixed with egg yolks)
Cream of Tartar – 1/4 tsp
Salt – 1/8 tsp
Sugar – 2 tsp (to be mixed with egg whites)
Heavy Whipping Cream – 1/2 cup
Vanilla Extract – 1/2 tsp
Powdered Sugar – 1 Tbsp