Which type of healthy foods to gain weight?

Foods to help w : Healthy weight gain: almonds, cashews, pecans, sunflower seeds, flax seeds, walnuts, hummus, avocadoes, granola, trail mix, dried fruits, extra virgin olive oil, canola oil, protein shakes, protein bars, lean meats, poultry, fish, smoothies (w added silken tofu or powdered milk), greek yogurt (full –fat), pasta/ bagels & use of juice rather than soda. Some people add whey proteins.