Crisp the bacon in a large deep skillet over medium heat until golden. Transfer to a plate; leave drippings.
Season chicken with 1 tsp salt, pepper, and smoked paprika. Add olive oil to the skillet.
Sear chicken over medium-high heat until browned on both sides, 3–4 minutes per side. Remove to a plate.
Lower heat to medium. Soften onion in the pan, 3 minutes. Stir in garlic for 30 seconds.
Toast the orzo in the aromatics for 1 minute, stirring to coat.
Pour in chicken broth and BBQ sauce. Scrape up browned bits and bring to a lively simmer.
Nestle chicken back into the pan. Cover and cook 8 minutes, then stir in tomatoes and red pepper flakes.
Continue simmering, uncovered, until orzo is tender and chicken hits 165°F, 4–6 minutes. Stir in remaining 1/4 tsp salt.
Off heat, swirl in butter. Sprinkle cheese over chicken and orzo. Cover to melt, 2 minutes.
Top with crumbled bacon, green onions, and parsley. Rest 2 minutes, then serve hot.