Help needed high calorie baby food!!!

My 12 month old is the height of a 2 yr old and skinny as a rail but I feed himALL DAY and he still gets lots of formula too. He’s an eating machine and runs all day burning calories. 2-3 avocados a day helped for a while but they don’t cut it anymore to keep weight on, and he’s allergic to cow dairy and beans/legumes bloat his stomach no matter how prepared. He doesn’t care for nut butters when I add them to things he just turns up his nose. Doc said high calorie diet but didn’t give ideas. He legit gets 6 bottles and 5 meals. Kid is a machine literally sprints and does pull ups and squats 🫠🫠🫠Please give me ideas for high calorie foods!!!!