Rose-colored glasses will not be needed to appreciate the variety of colors and blend of tastes offered by these.
Preheat oven to 350ºF and place oven rack in middle-high position.
Microwave frozen vegetables, then pat dry. Brush all bread slices lightly with oil and spread each with about 1-1/2 tablespoons sauce.
Combine all vegetables in a medium-sized bowl. Carefully spoon vegetable mixture equally onto bread slices. Sprinkle with oregano and garlic powder and then with cheese.
Bake in preheated oven about 5 to 7 minutes, until bread is brown on the edges and all vegetables are piping hot. Serve immediately.