If you want more fat, you can eat ice cream and milk shakes. If you want more muscle, eat more protein. Eat eggs. Get some protein powder and collagen powder. My favorite protein powder is the Jocko Molk, it is milk and egg protein and also has probiotics and digestive enzymes.
Protein for muscle, and carbs and fat for energy. The most common meal in the most different countries around the world is chicken and rice. Rice and beans and some kind of meat. Vegetables will not give you as many calories as meat, eggs, fish.