Deep Dish Peanut Butter Pie with Chocolate Covered Pretzel Crust

6 cups pretzels, crushed well (about 3 cups of crumbs)
1 1/2 sticks (3/4 cup) melted butter
1/4 cup granulated sugar
1 cup milk chocolate chips

2/3 cup peanut butter
8 ounces softened cream cheese
1 teaspoon vanilla
2 cups powdered sugar
2 cups heavy whipping cream, whipped (or about 4 cups of whipped cream or cool whip)
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