In a medium saucepan, bring the chicken broth to a boil. Add the rice, reduce heat to low, cover, and simmer for 18-20 minutes until the rice is tender and the liquid is absorbed. Remove from heat and set aside.
While the rice is cooking, heat olive oil in a large skillet over medium-high heat. Season the chicken thighs with garlic powder, onion powder, salt, and pepper. Add the chicken to the skillet and cook for 5-7 minutes on each side until golden brown and cooked through. Remove the chicken from the skillet and set aside.
In the same skillet, reduce the heat to medium and add the heavy cream, stirring to combine with the drippings. Add the shredded cheddar cheese, frozen mixed vegetables, thyme, paprika, and stir until the cheese is melted and the mixture is creamy.
Slice the cooked chicken and return it to the skillet, coating it in the creamy sauce. Simmer for an additional 2-3 minutes to heat through.
Serve the creamy chicken over the cooked rice and garnish with fresh parsley if desired.