There are plenty. The trick is finding ones that you will actually do. For me, a shake with milk, eggs, protein powder, coconut oil, peanut butter, a banana, and spinach every morning was an easy way to get nearly 1,000 calories in for breakfast. This put me in a good position to hit my caloric goals by the end of the day. Eating calorically dense food: red meat, whole milk, nuts, avocado, and rice are also smart strategies. More detail is provided in the "diet" section above.