Which chocolate/coffee dessert can you make without an oven?

Hello, I want to make a chocolate and coffee dessert but I don't have an oven. I don't really care about calories or diary restrictions, I'd just like a tasty treat.

I have the following ingredients and I can pick up one or 2 extras if you think it's necessary:

• semisweet chocolate

• dark chocolate

• mexican chocolate

• unlimited amount of espresso

• oreos

• graham cookies

• cocoa

• vanilla extract

• cornstarch

• unflavored gelatin

• heavy cream

And all your dairy basics (milk, butter, eggs, etc). Thanks in advance!

bon appetit