Preheat oven to 350 degrees.
Place chicken in lightly oiled 9x13 inch baking pan. Season with salt and pepper to taste.
Place in preheated oven and bake 20 minutes.
While chicken is baking, in large skillet, melt oil on medium high heat.
Saute onion and garlic until onion is transparent.
Add both bags of defrosted spinach. Cook until heated through.
Add seasonings: salt, pepper, red pepper flakes, and Italian seasoning.
Turn heat to low and stir in cream cheese and yogurt.
Once cream cheese is melted, add artichoke hearts and Parmesan cheese.
Spread spinach mixture over chicken and bake 25 more minutes.