1. Arrange the toast slices in a single layer on a work surface. Spread 2 tablespoons of the Sun-Dried Tomato and Walnut Pesto on each slice of bread. On 4 of the slices, arrange the cucumber in a single layer, covering as much of the bread as possible, and season with just a pinch of salt and pepper. Place a slice each of provolone, cheddar, and Swiss cheese on top of the cucumber. Divide the avocado slices evenly among the sandwiches and season with salt and pepper. Spread 2 tablespoons of the sun-dried tomatoes evenly over the avocado.
2. In a small mixing bowl, toss the sprouts with the olive oil and a pinch of salt and pepper. Spread 1/4 cup of the sprouts over the tomatoes on each sandwich. Complete the sandwiches with the remaining slices of toast.
Yield: 4 sandwiches