Mix smoked paprika, garlic powder, onion powder, chili powder, thyme, oregano, and cayenne pepper in a small bowl.
Season chicken breasts with half the cajun seasoning plus salt and pepper.
Cook sliced bacon in large skillet over medium-low heat for 10 minutes until crispy.
Add butter and olive oil to bacon fat, increase heat to medium, then sear chicken 3 minutes per side until golden.
Remove chicken and set aside.
Add diced onions, bell peppers, and celery to skillet with salt, pepper, and 1 tsp cajun seasoning.
Cook 3-5 minutes until softened.
Stir rice into vegetables until coated.
Add chicken stock and juice of 1 lemon, then nestle chicken back into skillet.
Bring to boil, cover, reduce to simmer, and cook 15-20 minutes until rice absorbs liquid and chicken reaches 165F.
While rice cooks, combine heavy cream, diced garlic, tomato paste, and remaining cajun seasoning in separate saucepan.
Heat over low 5-7 minutes until thickened, then add juice of 1 lemon and whisk.
Pour cream sauce over cooked rice and chicken.
Remove chicken, slice, and toss everything together.
Squeeze remaining lemon over top before serving.