Remove tendon from chicken fillets. Dice the dried tomatoes and mix with dried Herbs Provence.
In a large pan over medium heat, warm the olive oil for 1 minute. Add tomato paste, balsamic vinegar reduction, and sugar. Cook for 1 minute, stirring frequently, until caramelized.
Add the diced dried tomatoes and garlic. Cook for 3 minutes over medium heat, stirring occasionally.
Add the chicken breast strips. Cook for 3 minutes over medium heat, stirring occasionally, until chicken reaches 74°C / 165°F internal temperature.
Add the sliced onion. Cook for 2 minutes over medium heat, stirring occasionally.
Add the quartered cocktail tomatoes. Fold gently to combine. Remove from heat and let rest for 2 minutes. Season with salt and pepper.