Line a baking sheet with parchment paper and set aside.
Place the softened cream cheese in a large bowl and beat until smooth and creamy.
Add 1 1/2 cups powdered sugar, vanilla extract, and salt. Mix until fully combined.
Melt the semi-sweet chocolate in the microwave in 20-second bursts, stirring between each burst, until smooth. Let it cool for 5 minutes.
Add the melted chocolate to the cream cheese mixture. Beat slowly at first, then mix until thick, glossy, and uniform.
Cover the bowl and refrigerate for at least 1 hour, or until firm enough to roll.
Scoop tablespoon-sized portions and roll them into 1-inch balls. Place them on the prepared baking sheet.
Chill the rolled truffles for 15 to 20 minutes if they feel soft.
Place cocoa powder, powdered sugar, chopped nuts, and sprinkles in separate shallow bowls.
Roll each chilled truffle in your chosen coating until evenly covered.
Return the coated truffles to the refrigerator until ready to serve.