In a large pot, heat the olive oil over medium heat. Add the diced chicken, garlic powder, onion powder, salt, and pepper. Cook until the chicken is browned and cooked through, about 5-7 minutes.
Add the chicken broth and bring to a boil. Stir in the orzo and broccoli florets. Reduce heat to a simmer and cover. Cook for about 10-12 minutes, or until the orzo is tender and the liquid is mostly absorbed.
Remove the pot from heat and stir in the cheddar cheese, Parmesan cheese, heavy cream, and lemon juice until the cheeses are melted and everything is well combined.
Let the dish sit for a few minutes to thicken before serving.