Roast Beef & Tomato Sandwich Pizza

Ingredients

• 2 cups fresh baby spinach
• 2 plum tomatoes, chopped
• 1/2 cup thinly sliced red onion
• 1/2 cup thinly sliced sweet yellow or orange pepper
• 1/3 cup balsamic vinaigrette
• 4 ounces reduced-fat cream cheese
• 1/4 cup mayonnaise
• 2 tablespoons minced chives
• 2 tablespoons horseradish sauce
• 1 prebaked 12-inch pizza crust
• 8 ounces sliced deli roast beef, cut into strips
• 1 green onion, chopped