Any quick meals I can make that are high in protein and fiber? (It’s to gain weight)

Tuna salad (can of tuna, 1-2 boiled eggs, mayo, pickles) and an apple on the side. Or tuna, mayo, celery and chopped apple. Thick slices of bread and / or oil based tuna if you want additional calories.

If you eat meat, eggs and bacon are a classic combo and only take a few minutes to make.

Lettuce with cottage cheese, pickled beets, rotisserie chicken, tomatoes, baby carrots, and raspberry vinaigrette are a high protein lunch option. It could be hard to gain weight with meals like this unless you up size your portions.

Tacos with ground beef or turkey, lettuce, tomato, sour cream, shredded cheese, and salsa are a family favorite at my house.

Hummus and raw veggies on the side for more fiber.

For higher calorie meals, make breakfast casseroles: hash browns and eggs for the base, cooked sausage or ham mixed in, milk, seasonings like salt, pepper, and oregano, and a bag of frozen southwest veggies to up the fiber. Lots of cheese sprinkled on top. Bake at 350 for 45-60 minutes. If you don't have hash browns, use torn up bread or frozen tater tots. If you are keto, skip those elements. If vegetarian, skip the meat.

Casseroles take a good half hour to assemble and an hour to bake but then you've got lunch for the week.