Melt butter in a large saucepan over medium heat. Add the leek and cook for 2 minutes without browning.
Thinly slice raw chicken breasts. Increase heat and add the chicken to the saucepan. Cook for 3 minutes or until the chicken is browned.
Add the stock/broth, garlic, tomatoes, sugar, and basil. Bring to a boil, then reduce the heat and simmer for 5-6 minutes, or until the chicken is tender. Season and garnish with extra fresh basil. Serve with crusty bread.
Notes
Source: Adapted from the Quick Short Chicken Recipes cookbookYou're Gonna Bake It After Allbakeitafterall.com