Cook pasta according to packet instructions.
When pasta is almost cooked, heat a little butter or olive oil in a frying pan over medium heat. Add grated mushroom and zucchini together to the frying pan and fry for a minute or two until tender, using a spatula to stir occasionally.
Strain cooked pasta and add pasta to the frying pan with the vegetables.
Add greek yoghurt (or double cream if you're using that instead) and stir to coat the pasta.
Add grated cheese and stir until it starts to melt through.
Serve.
Makes 3 toddler-sized servings, 2 kid-sized servings, or 1 adult-sized serving.