1Drain tomatoes, reserving juice. In food processor bowl with metal blade, place reserved juice, peanut butter, cilantro leaves, garlic, salt and pepper flakes. Cover; process with on-and-off pulses until mixture is pureed.
2In medium bowl, combine cumin and cinnamon. Add chicken; toss to coat.
3In 12-inch nonstick skillet, heat oil over medium-high heat. Add chicken to skillet; cook 5 minutes, turning occasionally, until chicken is light golden brown. Stir in tomatoes and peanut butter mixture. Heat to boiling. Reduce heat to low; simmer uncovered 5 minutes to blend flavors.