Ultimate French Bread Pizza

Name: Ultimate French Bread Pizza
Ingredients: 1 loaf French bread (about 14 ounces ); 4 tablespoons butter , room temperature; 3 tablespoons olive oil , plus more for finishing; 1 cup canned crushed tomatoes (about 1/2 a 14-ounce can); 2 cloves garlic , 1 finely grated and 1 whole; 1 teaspoon dried oregano; 1/2 teaspoon chili flakes; Kosher salt , to taste; 4 1/2 ounces fresh mozzarella cheese; 1 sprig fresh Italian basil