Birthday Cake Fudge with creamy vanilla fudge, chocolate fudge, Nilla Wafers, and sprinkles is filled with sweet birthday cake flavor and looks like little pieces of funfetti cake with chocolate frosting. Perfect treat for birthday parties or any celebration.
Line an 8x8 square pan with parchment paper or foil sprayed with nonstick cooking spray.
In a large bowl, stir white chocolate chips, 3 tablespoon cubed butter, ⅔ can condensed milk (¾ cup + 2 tbsp), 1 heaping cup mini marshmallows, and ½ teaspoon salt. Microwave 45 seconds and stir. Continue heating in 30-second increments, stirring gently, until chips, butter, and marshmallows are mostly melted. Mix in almond and vanilla extracts. Heat 15-30 seconds more if needed. Stir in Nilla Wafers, then briefly stir in sprinkles (to avoid color bleeding). Pour into the prepared pan and gently smooth the top.
In a small bowl, stir dark chocolate, the remaining 1 tablespoon butter, ⅓ can condensed milk, ½ heaping cup mini marshmallows, and a dash of salt. Microwave 30 seconds and stir. Heat another 30 seconds (or more as needed) until mixture is melted. Stir in the vanilla.
Gently spread the chocolate fudge layer over the white chocolate fudge layer. Immediately sprinkle the top of the fudge with more sprinkles and gently press them into the fudge with a spatula.
Chill fudge for at least 2 hours, up to overnight. Use a sharp knife to cut fudge into small squares, wiping the blade between cuts.
Notes
Jimmies, rod-shaped sprinkles, run less than other types of sprinkles. Still, very briefly stir them into the fudge. Nonpareils work fine on the top layer without bleeding color.
Be careful not to overheat or overstir the fudge. Overheating can cause the fudge to seize, and overstirring can cause it to seize or separate and become oily. If this happens, don't panic! See FAQs on the post to see how to save it.
Remove fudge from fridge 15-20 minutes before cutting for easiest cutting and to prevent splintering.