Great advice, everyone!
My two are fed almost entirely home-prepared food too, though I give them most meats raw in their homecooked recipes. Emma is 6.5 lbs and gets 1/3 cup twice daily, plus treats, and a snack before bed of about 2 T. of kibble, or something else like cheese/whole grain crackers, or fruit and cottage cheese. Milli weighs 4.5 lbs and eats 1/4 cup 2x daily, plus treats. She does manage to get part of Emma's snack though
We started feeding Emma the 3rd "meal" because she metabolizes food really quickly, and will wake up in the middle of the night wanting to eat. If she has a little snack around 9-10 pm, she'll let me sleep until 6
Another thing to remember is that kibble is more dense than homemade food-the fresh foods in the homemade recipes contain more water. I account for that, and feed a little more homemmade food in one serving than I would if I was feeding kibble.