Cheesy Cauliflower Steak Pizzas

Name: Cheesy Cauliflower Steak Pizzas
Ingredients: 2 medium heads cauliflower (about 2 lbs. each); 3 tablespoons extra-virgin olive oil; 2 teaspoons minced garlic; 1 teaspoon Italian seasoning; 1/2 teaspoon ground pepper; 1 cup lower-sodium marinara sauce; 1 cup shredded low-moisture part-skim mozzarella cheese; 1/2 cup cherry tomatoes , halved; 1/4 cup thinly sliced red onion; 4 quartered artichoke hearts , halved lengthwise; 1/4 teaspoon crushed red pepper; 1/4 teaspoon salt; 2 tablespoons fresh basil leaves