Heat oil in frypan or saucepan. Add mince, chopped onion, chopped vegetables (if using). Stir until mince is a little browned.
Add herbs, tomato paste & water if needed. Stir and leave to simmer while preparing pasta & the white sauce.
Boil water and add GF pasta. Cook for about 6 minutes until tender.
Meanwhile make the white sauce. Melt the butter in a microwave prove dish. Stir in the flour and slowly stir in 1 cup of milk, add the nutmeg. Microwave for 2 minutes on high & stir. Repeat process until sauce is thick. Add the cheese or egg once thick and stir to combine.
Mix the sauce into the pasta & and then mix it all into the mince. Serve with carrots & peas.