Chocolate???

Ok no judgements please... LO is 10mo old and my supply is starting to drop. I have a big frozen stash which is enough to get her through to a year without formula, but she won't drink the frozen milk. She will drink freshly pumped and refrigerated breast milk, but once it's been frozen she won't touch it. She nurses for the most part but we're starting to need to supplement a bottle or two a day. DH suggested we add a little bit of ovaltine to the frozen milk so she'll drink it. Not a lot and definitely not anywhere near a full serving, but a half a spoon or so just to entice her enough to drink it. What do you guys think? I feel like it would be a better option than formula, and it's only a bottle or two a day. We could even just give it to her in a Sippy cup