Wipe mushrooms clean + thinly slice; heat 1 tbsp oil in a skillet over high, add mushrooms + cook undisturbed 3 min; sauté 3-4 min until browned + tender, season with salt/pep + set aside

Meanwhile, wash one pepper, cut off stem + remove seeds, then cut into bite-size pieces; pat 6 meatballs dry + chop into bite-size pieces

Preheat oven to 425°; top 2 crusts with 2-4 (or more!) slices of cheese, veggies + meatballs

Bake pizzas directly on oven racks for 10-13 min until crisp and golden