Preheat the oven to 400°F.
Lightly coat a large heavy-bottomed baking pan or baking dish with nonstick cooking spray.
Place the apricot preserves, Russian dressing, and French onion soup mix in a medium mixing bowl.
Stir until the sauce ingredients are fully combined.
Arrange the bone-in chicken thighs in a single layer in the prepared baking pan.
Pour the apricot and Russian dressing sauce evenly over the chicken thighs.
Use a spoon or spatula to spread the sauce over the chicken, ensuring each piece is well coated.
Place the pan in the preheated oven.
Bake for 75 to 85 minutes, or until the chicken is fully cooked and tender.
Check the internal temperature of the chicken using a meat thermometer.
The chicken is ready to serve when the thickest part of each piece reaches 165°F, avoiding contact with the bone when checking the temperature.
Remove the pan from the oven and allow the chicken to rest for a few minutes before serving.
Spoon additional sauce from the pan over the chicken, if desired.
Serve warm.