Ham and Egg Breakfast Pizza

Heat oven to 400°F (205°C). In a small saucepan, melt 2 tablespoons butter over medium heat. Add flour; cook for 1 minute, stirring constantly. Add milk and cook until mixture thickens slightly. Remove from heat. In a small skillet, melt remaining 2 tablespoons butter over medium heat. Add eggs and cook, stirring gently, until softly scrambled. Combine milk sauce with eggs; stir in salt. Place pizza crust on a baking sheet and spread eggs over the top. Top with ham, cheese, mushrooms and green onion. Bake 15 to 20 minutes or until cheese is melted and bubbly.