1 tablespoon extra-virgin olive oil
½ cup chopped onion
3 cups chopped cauliflower
½ cup chopped red bell pepper
½ teaspoon dried marjoram
¼ teaspoon salt
¼ teaspoon ground pepper
2 tablespoons pesto
4 slices whole-grain country bread, toasted
1 ¼ cups shredded extra-sharp Cheddar cheese
Heat oil in a large skillet over medium heat. Add onion; cook, stirring, until starting to soften, about 3 minutes. Add cauliflower, bell pepper, marjoram, salt and pepper; cook, stirring, until the vegetables are tender, 6 to 8 minutes more. Add pesto and stir to coat. Remove from heat.
Position rack in upper third of oven; preheat broiler to high.
Place toasted bread on a baking sheet and divide the vegetable mixture among the toasts. Top each with about 1/4 cup cheese. Broil until the cheese is melted and browned in spots, about 3 minutes.