Salted Caramel Brownie Trifle

• 12 tablespoons unsalted butter

• 1 1/2 cups sugar

• 2/3 cup cocoa powder

• 1 teaspoon vanilla extract

• 3 large eggs

• 1 cup flour

• 1 cup sugar

• 6 tablespoons unsalted butter, room temperature

• 1/2 cup heavy cream, room temperature

• 2 teaspoons maldon sea salt flakes

• 4 large egg yolks

• 1/2 cup granulated sugar

• 1 cup whole milk

• 1 teaspoon vanilla extract

• 5 cups whipped cream

• 1 bar bittersweet chocolate, broken into pieces

• Salted caramel sauce

• Whipped cream