I sometimes make a very basic single-serving garlic soup for myself - particularly on a cold dreary day.
All I do is peel 2-4 cloves of garlic, depending on size, & saute them in a small saucepan in a little extra-virgin olive oil until lightly golden brown & slightly softened. I then remove the garlic to my soup bowl & gently but thoroughly squash the cloves with a fork. I then saute/toast a thin piece or pieces of bread (French, Italian, or even plain white in a pinch) in the olive oil left in the saucepan until it's also lightly browned, & add that to the garlic in the soup bowl. Lastly, I add chicken stock to the saucepan, heat that up, & pour it over the garlic & toast in the bowl with salt & pepper to taste. Voila!
Sometimes I'll tweak this with the addition of some chopped tomato or pour one beaten egg into the simmering chicken broth to make a sort of "garlic egg drop" soup.