Prosciutto & Chèvre Strata Gelson's

Ingredients

• 1 small sourdough boule, torn into bite-size pieces, divided
• 6 oz prosciutto, thinly sliced, divided
• 8 oz chèvre, crumbled, divided
• 4 oz provolone, grated or sliced, divided
• ½ cup leeks, chopped, divided
• 6 Tbsp basil, chopped, divided
• 5 large eggs
• 2 cups whole milk
• 1 Tbsp Dijon mustard
• ½ tsp salt
• Black pepper, to taste
• 3 Tbsp butter, melted