Parmesan & Gruyère Soufflé Gelson's

Ingredients

• 3 Tbsp unsalted butter, plus more for greasing pan
• ½ cup freshly grated Parmesan cheese, divided
• 1 shallot, diced small
• 2 garlic cloves, crushed
• 3 Gelson’s organic fresh thyme sprigs
• ½ tsp Gelson’s black peppercorns
• ¾ tsp kosher salt, divided
• 3 Tbsp all-purpose flour
• 1 cup whole milk
• 1 tsp Dijon mustard
• Gelson’s cayenne pepper
• Gelson’s ground nutmeg
• 2 cups freshly grated Gruyère cheese
• 4 large egg yolks
• 5 large egg whites
• ¼ tsp cream of tartar