Well if you are weighing yourself at night the scale will always be higher because you haven't (you know what) yet. As for your food and meal plan it appears that you know about the right foods to eat but try a day like this too, you may find a difference in your weight. Healthy fats include omega-3 essential fatty acids sources like tuna, salmon, flax, and walnuts. Protein powders and nutritional supplement drinks such as Ensure can be added as in-between meal snacks if you still need more calories. It would also be a healthy idea to add a small amount of flax seed oil and some psyllium powder to add some omega-3 essential fatty acids and extra fiber.
A high-quality multivitamin and mineral supplement is a good idea to make sure you are getting all of the vitamins and minerals you need. Remember that it can take a while to gain the weight you need, but be patient and continue to choose healthy foods until you reach your goal weight. Ok My husband and I eat TERRIBLY but we are both fairly trim (I have about 5 pds still to lose post baby, my husband is in excellent shape and his metabolism is insane) Anyway I have been feeding my oldest son Gerber Graduate meals and things like that to make sure he is getting all the nutrients he needs.

But it may be your scale because normally if your eating the right foods and the right amount of foods and staying at least moderately active you shouldn't be gaining any weight. Some protein powders are flavored and only need added water and some others can be blended with your choice of juice or milk to improve the taste. Some people find that their muscle mass increases with protein supplements that contain certain blends of amino acids such as creatine and glutamine. Resistance training exercises such as lifting weights will help to increase your muscle size. Calorie Count Plus has a large data base of nutrition information for almost any food you like to eat. Trail mixes contain healthy nuts, dried fruits and can add healthy calories to your diet.
One meal should have a healthy protein source such as fish, low fat meat, chicken or legumes plus two or three servings of vegetables. I usually eat MIni Wheats in the morning, with some crackers and a cheese sandwich for lunch (fiber whole wheat bread), a granola bar, and a regular meal with veggies for dinner.

Even though you need to increase your calorie consumption to gain weight, those calories should come from foods that are good for you. Aerobic exercises such as running and stationary bicycling are better for fat loss and excessive aerobic training may cause you to lose more weight. Green vegetables add lots of vitamins and phytonutrients while starchy potatoes and corn add extra calories. After dinner, I have yogurt, oatmeal and fruit as a night snack (10 PM) Every time I look on the scale, it seems that I gain pounds just like that. Resistance training can be done at a health club, gym or at home with the proper equipment. And doing cardio for 30 minutes about 3x a week and lifting weights (resistance training, it should be somewhat difficult what your lifting) 3x a week for 45 minutes.

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