Since a few month I am little bit into meal preparation or meal-prep. Largely through the book The Stealth Health Meal Prep Cookbook by Tom Walsh. However, I transform all the dishes in the book into vegetarian versions with soy granules or seitan. The advantages of Meal Prep for me are as follows.
I have built myself a calculator that helps me to create such dishes independently and to calculate their macronutrients.
Basically, there are many other influencers who publish similar recipes and cookbooks. Sometimes I try them out and add them to my collection. Most recipes actually consist of a large pile of chicken or beef, a smaller portion of rice, pasta or potatoes and a tasty low-carb sauce. Burgers and Boritos are also often popular. Actually, all portions have roughly around 500 - 520 kcal calories and the following macronutrients.
You can actually cook your favorite dishes, but you usually have to pay attention to the following things.
In the beginning I used an Excel spreadsheet to calculate the nutritional values for my own recipes, but that was getting too annoying. Simply enter the average nutritional values of all the ingredients for your dish and get the result.