Line a large baking sheet with parchment paper.
Add sugar cookies to a food processor and pulse until the cookies are ground down to a fine crumb. (This will be about 2 cups of crushed cookies.)
Add the cream cheese. Continue to pulse the mixture until smooth.
Scoop out the mixture and form it into 1-inch ball shapes. Place each ball onto the prepared baking sheet.
Chill the balls in the refrigerator for 30-45 minutes, or until firm.
When ready, add the white chocolate chips to a microwave-safe bowl. Heat in 20-second increments, stirring after each time, until the chocolate is melted and creamy.
Remove the truffles from the refrigerator. Working one at a time, gently drop the balls into the melted chocolate, making sure they are completely coated in chocolate.
Using a fork, lift out the chocolate-covered truffles. Use a toothpick or another fork to slide the truffle onto the parchment-lined baking sheet. (You may need to reheat the chocolate to keep it a thin mixture.) Immediately add sprinkles if using.
Place in the refrigerator for about 30 minutes, or until the chocolate has set.
Store the truffles in the refrigerator in an airtight container for up to 2 weeks.