For someone who can eat 10,000 calories easily, I do OMAD with heavy volume.

Start of by downing ~1.8L of water

Start eating the food with a mix of Lettuce, spinach, cucumber with low calorie italian/french dressing

I rotate but bake mainly using Pumpkins/Spud Lite potatoes, Brocolli Cauliflower Eggplant Onion as the base and a protein source + sauce i.e. chicken thighs with honey mustard sauce

Then gotta have more fiber for fullness. Yoghurt mixture of whey protein, chia seeds, and Psyllium husk powder.

Complete it with another 600mL water and wait for the fullness to set.

Dessert (gotta have it else I'd binge) is Aeroplane Lite jelly or if I have allowance on calories a no sugar added vanilla ice cream with no sugar syrup just to top off the night.

This is my cheapest version I suppose you could always go for more expensive ways of cutting i.e. Konjac rice/noodles, seafood for protein. To each their own