Instant Pot Snickers Cheesecake

For crust:

• 1 ¼ cup crushed Oreo cookies, whole
• 2 TBS unsalted butter

For filling:

• 16 ounces cream cheese, softened
• ⅔ cups granulated sugar
• 2 large eggs
• ¼ cup sour cream or nonfat plain Greek yogurt
• 1 cup chopped snickers candy bars

For ganache topping:

• ½ cup heavy cream
• ¾ cups milk chocolate chips (about 4 ounces)

For additional topping

• ¾ cups chopped Snickers bars
• ¼ cup Caramel sauce