So, how many burpees DO you have to do to work off a chocolate bunny's ears? How about a bag of mini eggs?
The answer, is ZERO.
Exercise is not a punishment for something "bad" you did. Exercise is something you do for your body, because you actually like your body. Hopefully, because you love your body. You care enough about it to engage in activities that get your heart rate up for heart health, that challenge your muscles for strength, that engage your mind for improved cognitive function. Or get those endorphins going as you crush goals. Or to participate in a supportive community. Any of those reasons. But not for punishment.
Exercise is not to be interchangeable with sitting on a chair in the corner in time out, or being grounded, or getting your credit card cut up. It is not a punishment, it is a privilege, and a chance to better yourself from the inside out.
You work out because you know that even though it kinda sucks during the breathless sweaty part, you know it makes you feel oh-so-good afterwards. You know that by working out, you make better food choices to fuel those workouts, because you want to perform better. You work out because you want BALANCE - balance between eating for health and fuel, and eating for pleasure and socialization - and not feeling guilty or deprived when switching back and forth from one to the other. Of course, there is a limit to how much chocolate you can eat before yes, the negative effects take place. But a little chocolate is not going to kill you. Everything in moderation.
Changing your mindset will change your outcome. Replace guilt and punishment with compassion and self-love, and the impact will be greater than any diet or workout regime you've tried.
Final thoughts: This isn't jail. Working out is not punishment. So enjoy that chocolate, and then work out because you WANT to, not because you HAVE to.