Steam broccoli and cauliflower until tender but not soggy. While the veggies steam, make the white sauce. Over medium-low heat, melt butter. Whisk in flour so a paste forms. Slowly add milk and whisk together. Keep over medium-low heat and whisk constantly until it thickens enough to coat the back of a spoon. Remove from heat and stir in Parmesan cheese. Once veggies are done, add them to the sauce.
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In a medium bowl, whip ricotta, olive oil, basil, rosemary, and black pepper. To deep dish pans, add a layer of ricotta mixture, then layer of veggies/white sauce, then spaghetti sauce, and finish with bread crumbs. Cover and freeze. To serve: Thaw. Uncover and bake at 400F for 20-25 minutes or until cheese begins to bubble. Bake for 40-50 minutes if still frozen.