Prep all panini sandwich ingredients per instruction above, set aside.

Place the ingredients for the dressing in a jar or bottle and shake until fully combined. Season with salt and pepper to taste and set aside.

Preheat a panini grill or skillet over medium heat. While heating, make the panini sandwich.

Mix the mayo and pesto in a bowl and then spread onto one side of each slice of bread. Layer with mozzarella drizzled with olive oil, basil, tomato seasoned with salt and pepper, and avocado. Top with the other slice of bread.

Grill the panini: If using a panini grill, spray with nonstick spray, press the sandwich down, and cook until the bread is crispy and the cheese is melted. If using a skillet, add the panini and cover with a lid. Cook on both sides until golden brown and the cheese has melted. While the panini is cooking, make the salad.

Add all salad ingredients to a bowl. Toss with dressing.

Serve: Cut each panini in half and enjoy with arugula salad, chips, and sparkling water (over ice, if desired).