Preheat your oven to 375°F (190°C).

In a large mixing bowl, combine the cooked macaroni, shredded cheddar, grated Parmesan, milk, and large eggs. Sprinkle in salt and pepper to taste, then mix until glossy and holds together well.

Grease a mini muffin tin using cooking spray. Spoon the macaroni mixture into each cup, filling about ¾ full and pressing gently to compact.

Sprinkle breadcrumbs evenly over the top of each filled muffin cup.

Bake for 15-20 minutes, until the tops are golden and crispy.

Let the bites cool slightly before serving. Garnish with chopped green onions if desired.