Pour coffee, Kahlua, triple sec, and rum into the crockpot. Stir to combine.
Cook on Low for 2 hours or until warmed through.
While warming make your burned sugar rimmed cups by cutting a lemon slice then rubbing it onto the top of the cup.
Dip the cup into the sugar.
Using a kitchen torch, burn the sugar on the rim of the cup. Do not stay in one spot too long to prevent hot spots.
Fill cups with hot coffee mixture then garnish with whipped cream and cinnamon.
Notes:
I used cream whipped to soft peaks but any whipped cream will dod.
You can also use triple sec liqueur to have more kick your drink.liqueurs
Be sure to use tempered glass and not over heat to create hot spots when burning the sugar. Not moving around enough while heating or using a thin glass can cause the glass to crack.