Add 1½ cups heavy cream to the basin of your stand mixer or a bowl. Reserve the remaining ½ cup of heavy cream. In a stand mixer fixed with the whisk attachment or with an electric hand mixer, whip until stiff peaks form ~5 minutes.
Meanwhile add ½ cup cream and 1 cup chocolate chips to a microwave safe bowl. Zap in the microwave on 30 second increments, stirring vigorously between each increment to melt the chocolate. Repeat until the chocolate is smooth, creamy, and glossy.
Add the chocolate to the whipped cream mixture and gently fold it in. Scrape the chocolate mixture into the prepared pie crust and fill to the top. (You may have some filling left over depending on the thickness of your crust and the size of your pie pan. Set aside and serve as chocolate mousse later!)
Chill for up to 24 hours.