Preheat oven to 375 degrees. Grease a 9×13 baking dish with 1 tbsp butter.
Mix together cottage cheese mozzarella and parmesan cheese until smooth. Combine egg, spinach, Italian Seasonings and salt.
Line dish with lasagna noodles. Alternate spinach cheese mixture with noodles.
In a sauce pan over medium heat melt butter. Stir in flour to create a roux. Slowly pour in milk while whisking so milk is absorbed in the mixture. Let cook for 5 minutes or until the sauce starts to thicken. Remove from heat and stir in mozzarella cheese.
Top lasagna with mozzarella cheese sauce and sprinkle with additional parmesan cheese. Bake for 60 minutes until cheese is melted and golden.
Let cool on heat safe surface and enjoy!
If you would like a heartier option with meat add cooked, ground italian sausage to layers.