In a large, oven safe skillet, heat the olive oil over medium-high heat.
Add the chicken breasts and cook for roughly 5 minutes on one side to brown it. Flip and brown the other side for an additional 3-4 minutes.
Remove the chicken breasts and place in the slow cooker.
In a medium bowl, add the cornstarch, slow whisk in the chicken broth to make a slurry. Pouring the liquid into the cornstarch helps keep the lumps to a minimum.
Stir in the garlic, Italian seasoning, red pepper flakes, heavy cream, and sun-dried tomatoes.
Pour this mixture over the chicken.
Cover and cook on high for 2 ½ - 3 hours or on low for 5-6 hours.
When ready, stir in the parmesan cheese.
Serve with rice, angel hair pasta, or a mixed green salad.
Garnish with sliced fresh basil or chopped fresh parsley.
Notes
Brown the chicken breasts before transferring them to the slow cooker. This gives it extra flavor and texture.
Make it spicier by adding cayenne pepper, or more red pepper flakes.
Use chicken tenders, chicken cutlets, or thighs.
Add extra vegetables like sliced bell peppers, mushrooms, or spinach.
Thicken the sauce with more cornstarch. Pour the liquid into the cornstarch to keep it from getting lumpy.
Use an all purpose flour mixture if you prefer.
Add freshly chopped basil or parsley for more color and texture.
Don't have Italian seasoning? Make your own with equal parts of oregano, basil, thyme, and rosemary.