Start with 24 cupcakes that have been baked and completely cooled. You can use your favorite flavor box mix, or your favorite from scratch recipe. (Consider using my chocolate cupcakes or vanilla cupcakes if you want a from scratch cupcake.) Place the cupcakes on a cookie sheet lined with wax paper. Make room for a second cookie sheet lined with wax paper in your freezer.: The aroma of fresh cake will be tempting, but a cool cake is essential so the frozen filling does not melt on contact. You should notice the cupcake surface is firm to the touch and there is no steam rising. If you try to hollow warm cupcakes, the crumbs will break away and the filling will turn watery, so always let them cool on a rack. One common mistake is rushing this step, which results in soggy edges and a messy assembly.
For sprinkle filled ice cream: scoop half of a 1.5 Q container of ice cream into a bowl and let it soften for a few minutes. Stir in 1/4 cup sprinkles, then place the bowl back in the freezer to firm up while you prepare the cupcakes. Otherwise, just have your favorite flavor ice cream in the freezer and ready to go.: The softened ice cream will surrender its icy rigidity just enough to stir without becoming liquid. You will see it lose its sharp edges and become scoopable, and the smell will become more aromatic. Stir in the sprinkles quickly, then refreeze the bowl so the mixture firms. If you skip refreezing, the filling will slump inside the cupcake and leak out. Avoid letting the ice cream sit too long at room temperature or it will melt beyond rescue.
To prep the cupcakes: use a pairing knife to cut a large circle (about the size of a half dollar) in the top of the cupcake. Cut down almost to the bottom of the cupcake, then lift out the cut part. You should end up with a cone shaped chunk of cake. Slice the cone off of each of the cupcake pieces. (You need to make the piece of cake smaller, because the cupcake will be filled with ice cream.): As you cut you should hear a soft tearing of crumb rather than a clean slice, and you will see the carved piece form a cone. The goal is to remove a cone shaped chunk so the cavity can hold the ice cream . Slice the cone off so the lid is flat and can be pressed back on. A frequent error is cutting too deep which risks puncturing the base, so stop just shy of the bottom to maintain a stable cup.
I suggest you prepare all the cupcakes for the ice cream, then place your second cookie sheet in the freezer. Work in batches of 3-4 cupcakes, filling with ice cream, then placing on the cookie sheet that’s in the freezer. That way the ice cream won’t melt out of the cupcakes.: Lining a cookie sheet with wax paper and chilling it creates a cold staging area. As you work in batches of three to four, transfer filled cupcakes to that frozen sheet so the filling sets quickly. Sensory cues include seeing condensation form if items are too warm, which signals the need to pause and refreeze. Not using a chilled sheet will cause the ice cream to melt into a puddle, which creates an uneven finish.
Scoop about 1-2 tablespoons of ice cream into the center of each cupcake. Place the top back on and press gently. Put the cupcake on the cookie sheet in the freezer. Continue until all the cupcakes are filled and in the freezer.: The softened filling should be dense but malleable, and when you press the top back on you will feel a modest resistance as the filling nests inside. Work quickly so the filling maintains its coldness, and gently press the removed top back in place to seal the cavity. You might notice a faint coldness on your fingertips, that is normal. One mistake is overfilling which forces the top off and creates an uneven surface that is hard to frost.
Cover the cupcakes with plastic wrap (leaving them on the cookie sheet) and freeze for at least 4 hours before serving. You can place them (frozen) in a single layer in large: As the cupcakes chill you will observe the filling firm and the cupcake surface stabilize. The frozen sheet also makes it easy to transfer them to storage containers later. Avoid stacking the cupcakes while they are still soft, as they will stick together and distort. If you try to rush this step the frosting stage will be messy and the decorations will slide off.
Ziploc bags and freeze for up to 1 month before serving.: During this time the ice cream refreezes into a scoopable, stable center. You will know they are ready when the filling no longer gives under gentle pressure and the cupcake feels uniformly cold. A common mistake is opening the freezer frequently which causes thawing and refreezing, leading to grainy texture in the filling.
When ready to serve, have your frosting or a thawed carton of Cool Whip ready. Remove a cupcake from the freezer, frost as desired, and serve immediately. (For an amazing chocolate frosting recipe try this one or for vanilla, this is my favorite.: Proper packaging prevents freezer burn and keeps the cupcakes tasting fresh. Press out excess air and label the bag with the date to track freshness. If moisture migrates in, you may notice icy crystals on the surface, which indicates imperfect storage. Avoid stacking without protection because the decorations or frosting can flatten under pressure.
When ready to serve have your frosting or a thawed carton of Cool Whip ready: Remove a cupcake from the freezer and frost immediately, the cold center will keep the topping from sliding. The frosting provides both visual appeal and an insulating layer that slows melting as you serve. If the frosting is too stiff it will crack on the frozen surface, so bring it to a pliable spreadable consistency before using. One mistake is letting the cupcake sit at room temperature too long before frosting which softens the cake and causes collapse.
Frost as desired and serve immediately: The moment you spread frosting you will notice the contrast of textures and temperatures, and the aroma of frosting will complement the frozen center. Serve right away so guests experience the intended creaminess and chill. If you let them sit, the filling can soften and the balance will be lost, which is the biggest serving pitfall to avoid.