Banana Bread Crepe Cake With Butterscotch

Ingredients

• 4 tablespoons butter, melted and cooled slightly, plus extra for greasing pan
• 1 large (6 ounce) speckly ripe banana (schooled yield a scant 1/2 cup pureed)
• 1 cup milk
• 3/4 cup all-purpose flour
• 4 large eggs
• 2 tablespoons light brown sugar
• 1/2 teaspoon vanilla extract
• 1/4 teaspoon table salt
• 1/2 teaspoon ground cinnamon
• 1/4 teaspoon freshly grated nutmeg
• pinch of ground cloves
• 8 ounces cream cheese, well-softened
• 1 1/2 cup plain greek-style yogurt
• 1/3 cup granulated sugar
• 1/2 teaspoon vanilla extract
• 1/2 cup heavy whipping cream
• 1/4 cup packed dark brown sugar
• 1 tablespoon unsalted butter, at room temperature
• 1/2 cup chopped walnuts, toasted
• 1/2 teaspoon vanilla extract
• 1/4 teaspoon flaky sea salt, or to taste