Directions

1. Preheat oven to 375 degrees. In a microwave-safe bowl, season tomatoes with Italian seasoning and any optional spices. Set aside.
2. Break string cheese sticks into 3rds, place in a food processor/blender, and blend at high speed until shredded/grated. (Or just tear into pieces and roughly chop.) Set aside.
3. Bring a large skillet sprayed with nonstick spray to medium-high heat on the stove. Add mushrooms and onion. Stirring occasionally, cook until softened, about 4 minutes. Transfer to a bowl lined with paper towels to absorb moisture. Set aside.
4. Add spinach and garlic to the skillet. Stirring frequently, cook until wilted, about 1 minute. Add to the bowl with mushrooms and onion. Remove paper towels. Blot veggies with more towels to remove excess liquid.
5. Add pepperoni and half of seasoned tomatoes to veggies. Mix well. This is your filling. Set aside. Spray a baking sheet with nonstick spray. Set aside. Unroll dough sheet, and make sure it's even in thickness. Slice into 5 strips, each about 3" X 9".
6. Sprinkle workspace with flour, and place one dough strip in the center. Fold strip in half twice, and flatten with your palm. Use a rolling pin dusted with flour to roll dough into a large oval-ish shape, with longer sides on top and bottom. Place 1/5th of filling in the center. Top with 1/5th of grated/shredded cheese and 1 tsp. Parm. Stretch and pull the top of dough over filling to meet the bottom, forming a crescent. Use your fingers or a fork to firmly seal edges. (Doesn't need to look perfect!) Carefully transfer to baking sheet. Repeat 4 times with remaining ingredients, re-sprinkling space with flour, if needed.
7. Poke a few slits in each calzone, to let steam escape. Bake 16 - 18 minutes, until golden brown. Meanwhile, heat remaining tomatoes in the microwave. Let calzones cool slightly; serve with tomatoes for dipping!