I mean that’s a hard choice to make, as others say, really, the best meal you can cook is the one you want the most at the time! Whether it be matzoh ball soup from a box all the way up to the time I spent 36+ hours making an elaborate multi-course dim sum extravaganza!
To make it easier on everyone, I suggest our honorable OP @Dung_Beetle put some limits on it, such as “favorite meal that you cook at least once a week / month / biannually” or something similar. IE something you really LIKE, something you can cook yourself, and something you’re willing to do with some degree of frequency.
And that leaves out favorite meals you cook but DON’T because the materials are too expensive.
With that out of the way, and staying with the OP’s intent of something that you would “eat it until I did myself an injury” it would probably be orange glazed duck breast in a skillet. High heat sear, into the oven to finish to a medium rare verging on medium, from scratch orange sauce with orange juice, zest, brown sugar and a bit of white wine, served with rosemary garlic mashed potatoes (golden and russet mix).
But I only do it 3-4 times a year due to cost.
Still, if I could afford it, I’d gorge on duck breast until I was sick. I guess, technically, now that beef is so pricey, it might be cheaper than duck often, but I only buy beef on steep sales.
One that would qualify by my earlier suggestion of at least once a month would be maki sushi made with scallions and smoked salmon, along with roasted red bell pepper marinated in soy nigiri. I buy cheap smoked salmon trim which is more or less reasonable for the quantities needed, scallions/green onions are cheap, as is sushi rice by volume. And the roasted red bell peppers, while not as amazing in any way as sushi grade tuna (to me), cost very little on sale, and are still amazing.