Should I tell my girlfriend that she isn't a good cook?

say you don't like her cooking, don't say she's not a good cook. and be gentle ofc she sounds really sweet and you don't want to hurt her 😔

Make your own food then lazy ass

Maybe start with one specific dish, about which you can say something constructive. "Say, I bet this would be better if...." (You used less oil, or whatever.) And as others have said, you could try being in the kitchen with her and make it a joint effort.

Maybe you guys can cook together and you can show her some tips and tricks to improve her cooking without directly having to say anything that might hurt her.

I'm sure she'd enjoy it if you cook with her, even if she's the type to insist doing the cooking.

No, if it's one of her flaws just accept it. I've heard some men say "I didn't marry her for her cooking" lol.

Can you message me?

Be careful with that, help more and maybe she will learn from you

Be straight, but gentle. Suggest cooking together