Preheat oven to 375 degrees.
For the alfredo sauce: In a saucepan over medium heat melt 1/2 cup butter. Add in cream and bring to a boil and reduce heat to low for 6 minutes, stirring occasionally. Add Parmesan cheese and cook for another 2 minutes until cheese is fully melted, stirring constantly. Remove from heat.
In a large skillet melt the butter and olive oil. Add the mushrooms and onion and cook until tender, about 5-7 minutes. Remove from heat.
In a large bowl add the mushrooms and onions. Then add the chicken, both cheeses, and rosemary.
Lay out cooked lasagna noodles on clean surface. Then spread 1/3 cup of the chicken mixture onto each lasagna noodle.
Spray cooking spray into a large baking dish then spread a thin layer of the alfredo sauce on the bottom.
Roll up each noodle tightly. Place in baking dish.
Pour remaining alfredo sauce over the roll ups.
Bake covered for 15 minutes. Uncover and bake for 5 minutes. Let stand for another 5 minutes.