Doing cardio to build muscle is doing it wrong.
Re-evaluate your goals and your workouts. Also, if you are burning 600-700 calories in a workout? You should be fucking ravenous unless you are in the 4k kcal range to maintain, which means you already know how to build muscles. Your tracker might be off by... a lot, if that isn't the case.
But, assuming all of the above is just completely wrong and you're really burning 600-700 calories in a cardio-specific workout and not feeling hungry? Add fats to things. Don't use Pam/extra virgin olive oil to cook your food; use butter. Don't drink fat-free milk; drink vitamin D. Skip heavy veggies because they will make you full with little caloric weight; stick with proteins and fats and load up on them. They also take longer to work through your system, so you won't feel hungry as often. But that doesn't matter as long as you have 1k+ calories in your stomach from a big ass steak and some butter smeared potatoes.
Smoke weed? It stimulates hunger feelings so if the physical eating aspect is the problem, go with getting right in the head and then approach it with a THC powered appetite. Works for a lot of cancer patients, who also don't feel a great deal of hunger as their body dissolves.
You have an oddly unique problem, and one that is really only answered (from a "what do I do" standpoint) by changing what you are doing. Going to more cardio workouts and still trying to build muscle is just approaching it from the wrong angle. Not an impossible angle, but you are making it incredibly difficult to achieve your goal (the muscle growth) by your activities (high cardio workouts). This is similar to people expecting fast weightloss while they are doing supersets and eating as I have described; you aren't going to make headway with the least effective approach easily, if at all.
