In a medium bowl, whisk together melted butter, garlic, 2 tablespoons of lemon juice and Italian seasoning; season with salt and pepper, to taste.
Dry the shrimp with some paper towel and place them in the bowl and toss to coat. Set aside to marinate while you make the Lemon Garlic Aioli and heat your oven.
In a small bowl, mix together the Lemon Garlic Aioli ingredients.
Preheat the oven to 400 degrees F and cover baking sheet with parchment paper.
Transfer the shrimp and all of the juices from your bowl to a large baking sheet, spreading them out in a single layer. Add the lemon slices to the pan.
Place into the oven and bake just until pink, firm and cooked through, about 12 minutes.
Sprinkle some fresh parsley and extra pepper. Serve immediately with the dipping sauce on the side.