5. Vanilla extract
Vanilla has always been one of the most popular and favored flavors in many dishes and drinks. Now it’s time you tried some vanilla in your coffee. Do not add sugar since vanilla creates a sweet sensation without any extras. The best part is that vanilla has zero calories and zero carbohydrates. Note that one serving of vanilla syrup contains more than 70 calories and almost 20 grams of sugar. One drop of vanilla extract per cup is enough to totally change the flavor and taste of your regular coffee.