Tuscan Spinach Torta

Crust

• 1 crust from 1 box (14.1 oz) refrigerated Pillsbury™ Pie Crusts (2 Count), softened as directed on box
• 1 tablespoon Dijon mustard

Filling

• 2 to 4 tablespoons unsalted butter, regular butter or margarine
• 1 (9-oz.) pkg. frozen spinach, thawed, squeezed to drain*
• 1/2 cup chopped red onion
• 1/4 cup chopped sun-dried tomatoes without oil
• 1/2 teaspoon dried Italian seasoning
• 1/2 teaspoon dried oregano leaves
• 1/4 teaspoon garlic powder
• 1/4 teaspoon salt
• 4 eggs
• 8 oz. (2 cups) shredded mozzarella cheese
• 1/4 to 1/3 cup pine nuts or slivered almonds, lightly toasted**