Besides nuts and nut butters, oils come in a close second in cal/g. Get a good bottle, with a secure lid, and carry some good oil. I always carry olive oil, and add a couple of ounces to every dinner. Coconut oil tastes good in oatmeal too.
But those bottles olive oil come in have some flimsy caps once they're opened the first time. I buy an 8 oz bottle and xfer the oil to an 8 oz Nalgene HDPE Wide Mouth Round Container.
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https://www.amazon.com/gp/product/B0...52/?th=1&psc=1
That cap ain't coming loose in your pack!