So there is a world type called Single Biome which allows you to create a world with only 1 biome of your choice. One of these biomes is 'The Void' which is literally just a flat stone world with no structures or features and the only mob that can spawn is phantoms. Well in this world I added a nether portal frame, a chest with resources, an end portal frame, a tree and a mooshroom that you can milk with a bowl to get mushroom stew for food. This world not only makes the biome liveable but also beatable.