Toss cauliflower florets with 2 tablespoons olive oil in a large bowl. Sprinkle with 1 teaspoon Italian seasoning and 1/4 teaspoon salt; mix well. Arrange in a single layer on a sheet pan.
Bake cauliflower for 30 to 40 minutes, tossing once halfway through, until tender and lightly charred. Cool.
Toss potatoes with 1 tablespoon olive oil in a bowl. Sprinkle with 1 teaspoon Italian seasoning and ¼ teaspoon salt; mix well. Arrange in a single layer on a sheet pan.
Bake potatoes for 20 minutes, until tender and lightly browned. Cool.
Place the greens from the Fresh Express® French Blue Cheese Salad Kit into a large bowl; add the roasted vegetables. Drizzle with dressing; mix well. Top with croutons and blue cheese.