Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat until hot. Add onion; sauté 5 minutes. Combine thyme and 1/4 teaspoon salt; sprinkle over chicken. Add chicken to skillet; sauté 6 minutes on each side or until done. Remove chicken from skillet; keep warm. Reduce heat to medium-low. Add 1/4 teaspoon salt, preserves, vinegar, and pepper, stirring constantly until the preserves melt. Spoon raspberry sauce over chicken.
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