Creamy courgetti with white bean sauce

small button mushrooms ((~ 2 cups))

cherry tomatoes ((~ 1 2/3 cups))

oil, (divided)

garlic, (peeled)

tin cannellini beans, drained ((240g, or ~ 1 1/4 cups, when drained))

Small bunch fresh parsley

water ((~ 1/4 cup))

Salt

Black pepper

large courgettes ((zucchinis))

extra virgin olive oil, to serve ((optional))