Heat olive oil in a large dutch oven or saucepan. over a medium heat.
Add the onions, celery,and peppers; saute' about 2 minutes, stirring frequently. Stir in the cabbage and garlic, season with black pepper, and cook for 3 minutes over low heat. Stir frequently.
Pour in the chicken broth and bring to a boil. Reduce heat to low, stir in chicken, salt, and seasoning packet from the FORTUNE UDON CHICKEN FLAVORED NOODLES package. Simmer for about 10 minutes, stirring frequently.
Add the frozen vegetables, cook 4 minutes, then add the noodles from the FORTUNE UDON CHICKEN FLAVORED NOODLES package. Cook 5 minutes, stirring occasionally.
Stir in the baby spinach and sweet chili sauce, simmer on low for 1 minute. Remove from the heat. Prepare a few hours ahead and allow flavors to blend for best flavor. Reheat prior to serving. Serve warm.