Steak and Blue Cheese Pizza

Ingredients

• 1 (8-ounce) boneless sirloin steak, trimmed
• ¾ teaspoon salt, divided
• ¼ teaspoon coarsely ground black pepper
• 2 tablespoons low-fat mayonnaise
• Mary's)
• 3 (7-inch) refrigerated individual pizza crusts (such as Mama
• 1 (8-ounce) package presliced mushrooms
• + 4 more ingredients
• • 2 cups vertically sliced onion
  • Cooking spray
  • ¹/₃ cup (about 1 1/2 ounces) crumbled blue cheese
  • 1 ½ teaspoons prepared horseradish

Preheat oven to 450°. Heat a large nonstick skillet coated with cooking spray over medium-high heat. Add onion and mushrooms; cover and cook 3 minutes. Uncover and cook 5 minutes, stirring occasionally. Stir in 1/4 teaspoon salt; remove onion mixture from pan. Sprinkle steak with 1/2 teaspoon sal...

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