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Heat the vegetable oil in a large skillet over medium-high heat until shimmering. Add vermicelli and toast, toss frequently with tongs. After 2 minutes, add chopped onions, continuing to toss until golden brown (about 2 minutes more).
Add chicken broth, Isadora Beans, and tomatoes. Reduce heat to medium, cover and simmer for about 15 minutes until vermicelli is tender.
Remove from heat, sprinkle with cheese and cover; let stand for about 3 minutes until cheese is melted.
Serve with sour cream and salsa, if desired.