If you only have regular vodka, just add 1/2 oz caramel syrup or sauce to get the flavor. Use a mix of Irish cream and heavy cream for extra richness, or half-and-half to keep it lighter. The caramel and salt rim is a must! Stir in the glass if you don't have a shaker. Adjust sweetness or creaminess to taste. Flavored coffee liqueurs work great for variety.