Any Suggestions for High Fat/High Calories/Carb recipe for Toddler 2yrs+

Hi mga Mommies! Pahingi naman po ng suggestions/recipes na rich in Fat/Calories/Carbs. Picky eater po yung anak ko and we need to get him reach at least 12kgs for operation. He's 2y3m old pero 10kg lang siya and side effect na nung sakit niya yung di magandang absorption ng nutrients. We are desperate and in need of help pagdating sa pwedeng options on what food we can offer to him. He is currently taking propan tlc, primovite and recently added heracline to stimulate his appetite but still, we are struggling on feeding. Any suggestions po ay icoconsider namin, mostly po mga budget friendly and easy to access ingredients sana. Thank you so much in advance! #pleasehelp #firstbaby #firsttimemom