Combine. In a large bowl, combine softened cream cheese, peanut butter, 3/4 cup powdered sugar, the vanilla & pinch of salt. Beat 2-3 minutes, or until light, fluffy, and evenly blended. Check for any lumps, then set this peanut butter mixture aside.
Whip Cream. In a large bowl (ideally a metal bowl or glass bowl!), combine 1 cup heavy cream with 1 Tablespoon powdered sugar. Use a hand mixer to beat on high speed until the mixture forms stiff peaks. (When the beaters are lifted out of the whipped cream and rotated, the whipped cream should hold its shape.)
Fold Together. Working in small increments (about 1/4-1/3 at a time), mix small amounts of the whipped cream into the peanut butter mixture. Do NOT whisk or stir! Carefully fold the whipped cream in a bit at a time, to lighten the peanut butter filling. (See video for a visual, if needed!)