Extra milk uses / in baby food??

Ly

Hi all! I pumped a lot early on to save up for when I went back to work.. with covid I didn’t go back and now have 400+ oz in my freezer. My LO just turned 1 and I stopped breastfeeding with the plan of giving him the frozen breast milk instead of cows milk for a few months .. however he isn’t drinking it!! I want him to get the milk for nutritional values - any thoughts on how I could put this in his food or anything to give it to him?? I’ve tried the milk hot/cold/room temp in his bottle and in maybe 5 different cups but he refuses all. I’ve tried making smoothies and mixing with fruit. He crushes water which is great but I’d love him to get this milk! Worst case I’ve donated a bunch already and can donate more but wanted to see if anyone had any creative ideas!