Step 1: Cut chicken breasts into 1-inch cubes and season with salt and pepper.
Step 2: Heat olive oil in a large skillet over medium-high heat. Add chicken and cook until browned on all sides, about 5-7 minutes. Remove chicken and set aside.
Step 3: In the same skillet, melt butter. Add onion and cook until softened, about 3 minutes. Add garlic and cook for 1 more minute.
Step 4: Stir in orzo and cook for 1 minute until lightly toasted.
Step 5: Pour in chicken broth and bring to a simmer. Cook for 8 minutes, stirring occasionally, until orzo is tender and liquid is mostly absorbed.
Step 6: Reduce heat to medium-low. Stir in heavy cream, parmesan cheese, thyme, and cooked chicken. Cook for 3-5 minutes until sauce thickens and chicken is heated through.
Step 7: Garnish with fresh parsley and serve immediately.