Frozen Mocha Oreo Bars

Ingredients (8)

• 5 cups crushed Oreos (about 4 sleeves)
• 8 Tablespoons butter
• 4 cups whipping cream
• 2 (8 ounce) packages cream cheese, at room temperature
• 2 (14 ounce) cans sweetened condensed milk
• 3 Tablespoons instant espresso powder dissolved in 1/2 cup hot water
• 1/4 cup chocolate sauce, plus more for the top
• 2 teaspoons vanilla