Triple Decker Key Lime Pie with Creamy Lime Layers

Ingredients

• 2 1/2 cups (250 g) graham cracker crumbs
• 1/4 cup (50 g) packed dark brown sugar
• 1 teaspoon ground cinnamon
• 1/2 cup (113 g) unsalted butter, melted
• 1 large egg white, room temperature
• 8 large egg yolks, room temperature
• 2 cans (14 oz each) sweetened condensed milk
• 1/2 cup (120 g) sour cream, room temperature
• 1 cup (240 ml) key lime juice
• 1 teaspoon finely grated lime zest
• 1/4 teaspoon fine salt
• 8 oz (225 g) cream cheese, softened
• 2 tablespoons granulated sugar
• 1/4 cup (60 g) sour cream, room temperature
• 1/2 cup (150 g) sweetened condensed milk
• 1/4 cup (60 ml) key lime juice
• 1 1/2 cups (360 ml) cold heavy cream
• 2 tablespoons powdered sugar
• 1 tablespoon key lime juice
• 1 teaspoon finely grated lime zest, plus more for garnish
• Thin lime slices, for garnish