Smoked Gouda, Caramelized Onion, & Arugula Grilled Cheese

It's national panini day! What better way to celebrate then with the most insanely delicious grilled cheese ever?! I know grilled cheese is traditionally not considered a "panini", but you can easily make this sandwich in a panini press & it'll get even crispier and extra melty (which is always a plus!). I’m really excited [...]