Start by sprinkling the chicken with Italian seasoning, red pepper flakes, salt, and pepper. This helps infuse the meat with flavor before cooking.
Place minced garlic, diced onion, and chopped sun-dried tomatoes on top of the chicken in the slow cooker. This builds layers of savory and tangy flavors.
Pour the chicken broth over everything, cover, and cook on low for 2–3 hours or on high for 1–1.5 hours. This allows the chicken to become tender while soaking in the flavors.
Once the chicken is nearly cooked, stir in heavy cream and uncooked orzo. Let it cook for another 20–30 minutes until the pasta is tender and creamy.
Stir in fresh spinach and grated Parmesan until the spinach wilts and the cheese melts. This final touch brightens the dish and adds a rich, savory finish.