Tomato Sauce: fried onion, added a tin of good chopped tomatoes, salt, pepper and sugar, before simmering.
Mushrooms and Spinach:
fried some mushrooms off in olive oil and garlic before adding a bag of spinach till it's wilted.
White Sauce and Pasta Sheets: Cheated! Bought a jar of white sauce and some dried pasta sheets that didn't need cooking.
I did a layer of spinach and mushrooms, a layer of tomato sauce and then pasta, then repeat! And then topped it off with the white sauce. This was the end result!!