In a sauce pot melt the butter and sauté the (vegetables ingredients from Butter and below only)until softened.
Add cream and watch it does not boil over.
Add cheese and spices until melted.
once melted put in blender and lightly blend.
Keep sauce warm.
Heat olive oil and combine all vegetables (zucchini, mushrooms, pepper, leeks) and fry until softened.
Add parsley and spinach until just lightly soft and then add ricotta.
Add the sauce (not all, but enough to your liking) and blend.
In a lasagna pan add a little sauce to bottom and start to stack lasagna with veggie sauce mixture with each layer. Also now add cheddar and mozzarella alternate until all pasta is finished top with the mixture and cheese and a little more sauce.
Preheat oven to 375 and cover lasagna bake for 20 minutes and uncover and bake an additional 15 minutes.
If your time is short you can substitute making the sauce with your favorite primavera packaged sauce mix.