While artichokes drain, add ½ cup unsalted butter to medium microwave-safe bowl. Microwave butter in 30-second increments, stirring well between each burst, until butter is melted but not bubbling or burnt.
Add 2 ½ cups breadcrumbs, ½ teaspoon lemon zest, ½ cup grated fresh parmesan, ⅓ cup chopped fresh parsley, 6 cloves garlic, 2 teaspoons salt, and 1 teaspoon freshly ground black pepper to bowl with melted butter. Mix ingredients together until fully incorporated and well blended, making sure to cover all breadcrumbs in melted butter.
Transfer artichokes to baking dish. One by one and starting with outermost row, carefully pull each petal away from artichoke and spoon plenty of stuffing behind and between petals. Repeat until outer 3 to 5 rows of artichoke petals have been stuffed with breadcrumb mixture, then repeat process with remaining artichokes until all breadcrumb mixture has been used.
Once all artichokes have been stuffed, place baking dish in preheated oven. Bake artichokes 8 to 10 minutes or until breadcrumbs are golden and toasted.
Optional, For Extra Crispy Breadcrumbs: When breadcrumbs are golden, switch oven to broiler setting on high. Broil 1 to 2 minutes or until breadcrumbs are deep brown. Be careful not to burn breadcrumbs.
When breadcrumbs are ready, remove baking dish from oven. Carefully transfer stuffed artichokes to serving platter or individual plates and garnish with additional chopped fresh parsley. Serve warm with aioli, melted butter, or dipping sauce of choice.