Line a baking sheet with parchment paper. In a food processor, pulse the vanilla cookies into fine crumbs. Add the cream cheese and lemon extract, pulsing until the mixture comes together into a smooth, almost paste-like consistency.
Scoop out about one-inch portions of the mixture and roll them into balls. Place the balls on the prepared baking sheet and refrigerate for about 30 minutes until firm. This chilling step helps the truffles hold their shape during dipping.
Place chopped white chocolate in a heatproof bowl over simmering water (or microwave in 15-second intervals, stirring each time) until melted. Stir in coconut oil and lemon zest for a glossy, flavorful coating.
Using a fork, dip each chilled truffle into the melted chocolate, allowing excess to drip off. Place them back on the parchment-lined baking sheet and immediately sprinkle with yellow sprinkles. Refrigerate for about 10 minutes until the chocolate sets.