Recommendations on healthy high-calorie foods?

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I'm looking to up my calorie intake. I've just started the food tracking piece of myfitnesspal back-up and I'm sure I don't get anywhere near what I think I need to make the modest lean mass gains I'm looking for. My aim is roughly 3800 calories a day. I would appreciate any recommendations on healthy, easy-to-make or buy, high-calorie foods or snacks to up my intake. Thanks!

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