Flatten chicken to 1/2-in. thickness. In a large resealable plastic bag, combine the Parmesan cheese, basil and oregano. Add chicken, a few pieces at a time, and shake to coat.
In a large skillet over medium heat, cook chicken in 2 tablespoons butter for 4-5 minutes on each side or until a thermometer reads 170°. Remove and keep warm.
In the same skillet, saute onions in remaining butter for 2-3 minutes or until tender. Add garlic; cook 1 minute longer. Gradually add flour and salt; stir in milk and sherry or broth until blended.
Bring to a boil. Reduce heat; cook and stir for 1-2 minutes or until thickened. Stir in spinach and pimientos; heat through.
Remove from the heat. Stir in sour cream until blended. Spoon over chicken; sprinkle with mozzarella cheese.
Find and share everyday cooking inspiration on Primary Recipe. We want to share with you my favourite, delicious family friendly recipes. We want to inspire you to create fantastic food for your family every day.