Preheat the oven to 350°F and coat a muffin tin with cooking spray.
In a skillet over medium heat, melt the butter and sauté the chopped onion until it turns translucent.
Incorporate the minced garlic and cook for an additional 30 seconds.
Pour in the heavy whipping cream, allowing it to simmer until it thickens into a sauce. Remove from heat and let it cool to thicken further.
In a small bowl, blend the pork rind crumbs with grated Parmesan cheese and set aside.
In a large mixing bowl, combine the shredded chicken, chopped broccoli, cheddar cheese, thickened sauce, salt, and pepper. Mix thoroughly to ensure even distribution.
Spoon the mixture into the prepared muffin tin, pressing down gently to pack each section fully.
Sprinkle the pork rind and Parmesan mixture over the top of each portion.
Bake in the preheated oven for 15 to 20 minutes, or until the tops are golden and crisp.
Allow to cool for 10 minutes before removing from the tin. Serve while warm.