How to Make It
Preheat oven to 450°F.
Heat a small nonstick skillet over medium-high. Add sausage, and cook, stirring and breaking up sausage with a wooden spoon, until cooked through, 4 to 5 minutes. Transfer sausage to a plate. Add zucchini and 1 tablespoon pesto to the skillet; cook, stirring often, until zucchini is slightly tender, about 3 minutes. Remove from heat.
Place pizza crusts on a baking sheet, and spread remaining 3 tablespoons pesto evenly over crusts. Top crusts evenly with zucchini mixture, sausage, mozzarella, and red pepper. Bake at 450°F until crusts are crisped on edges and cheese is melted, 7 to 8 minutes. Remove from oven, and sprinkle evenly with basil. Cut each pizza into 4 slices and serve immediately.