Place onion, tomatoes, garlic, and chicken broth into a blender and blend until smooth, about 20 seconds.
In a large pot over medium heat, add oil and alphabet noodles. Stir around frequently till noodles develop a light brown color. About 5 minutes.
Carefully pour in the blended tomato mixture and remaining broth. Stir, cover, and bring to a gentle boil for 10 minutes. Check noodles for softness and serve warm with queso fresco, or avocado slices.
Video
Notes
Store any leftovers in a container in the refrigerator. Keep in mind that the pasta will expand as it sits. You may need to add more water or broth to thin out the soup.
Nutritional information is provided as an estimate only and depends on ingredients and amounts used. Thai Caliente makes no guarantees to the accuracy of this information.