Prepare a baking sheet by lining it with parchment or wax paper to keep the cookies from sticking.
Add a spoonful of peanut butter to one Ritz cracker, then place another cracker on top to make a sandwich. Continue until all the crackers are used.
Microwave the white chocolate or almond bark in 15 to 30 second bursts, stirring between each round, until it melts into a smooth, creamy texture. Alternatively, use a double boiler on the stovetop.
Carefully dip each peanut butter cracker sandwich into the melted white chocolate, turning it until it is fully coated.
Set the white chocolate–covered cookies onto the lined baking sheet to cool and firm up.
If desired, drizzle extra white chocolate over the top using a spoon or piping bag for a decorative finish.
Sprinkle Valentine's Day sprinkles over the cookies while the chocolate is still soft so they stick.
Allow the cookies to rest for at least 15 minutes, or until the chocolate has fully hardened.
Once set, arrange the cookies on a serving tray or package them for gifting. Enjoy immediately or store them for later.