1. Preheat the broiler on your oven. (My oven has two broil options –high and low, I set mine to high). Position the oven rack in the middle. Generously spray a rimmed baking sheet with nonstick spray and set aside. Alternatively, line with parchment paper, however, parchment does slightly burn.
2. In a bowl, mix together the cream cheese, mozzarella cheese, Dijon mustard, 1/2 cup panko breadcrumbs, spinach, green onions, dill, and lemon juice. Gently fold in crab meat. Season with salt and pepper, to taste.
3. Add the remaining 3/4 cup panko breadcrumbs into a shallow bowl or rimmed plate.
4. Scoop crab mixture by 2 heaping tablespoon portions forming into a ball, about a size of a golf ball.  Lightly roll each ball in panko, covering all around. Transfer onto the prepared baking sheet, and top with a small slice of butter. You should get about 14 balls.
5. Broil for 3 minutes or until lightly golden. Check often so they don’t burn. Gently flip the crab balls and broil for additional 2-3 minutes or until lightly golden. (Mine took about 3 minutes on one side and 2 minutes on the other. Keep an eye on them as they burn easily). Serve immediately with spicy aioli.

Spicy Aioli

1. Whisk together all of the ingredients in a small bowl. Cover and refrigerate until ready to serve.