I have two ways that i semi regularly use:

Onion fine dice, oil in pan, sweat onion till translucent, dice tomatoes, herbs incl garlic and chilli flakes in the oil for a short while(dealers choice), tomatoes in, lid on for 10min, lid off until you’re at the right consistency, salt, maybe add sugar if not sweet enough.

Same ingredients in a glass backing dish, oven at 180°C for 35+ mins.

I don’t care to remove tomato skins so I never do.