Spinach and Feta Cheese Stuffed Mushrooms

large fresh mushrooms

chopped onion

minced garlic cloves

olive or vegetable oil

pkg cream cheese, softened

pkg. (10 oz.) frozen chopped spinach, thawed and well drained (paper towels work well to squeeze excess water out)

plus 2 tablespoons shredded Parmesan cheese, divided

crumbled feta cheese (you want this finely crumbled - food processor does great job)

bacon strip, cooked and finely crumbled

salt