Garlic and Cheese Popovers

INGREDIENTS

• 2 cups whole milk, at room temperature
• Vegetable oil cooking spray
• 1/2 teaspoon lemon zest
• 1/2 cup (1 stick) unsalted butter, at room temperature
• Kosher salt and freshly ground black pepper, optional
• 5 cloves garlic, minced
• 1/4 cup chopped flat-leaf parsley
• 1/4 cup (1-ounce) shredded sharp Provolone cheese
• 1 tablespoon chopped chives
• 2 teaspoons kosher salt
• 1 1/2 cups all-purpose flour
• 2 tablespoons anchovy paste
• 1 1/2 teaspoons fresh lemon juice
• 6 large eggs, at room temperature
• 1/2 teaspoon freshly ground black pepper
• 1 1/4 cups (3 ounces) finely grated Asiago cheese