Freeze The Nutella Balls: Prescoop 7 dollops of Nutella onto parchment paper. Each dollop should be one tablespoon. Try to make these round in shape (though it doesn't have to be perfect).
Make The Mochi Mixture: Combine the glutinous rice flour, sugar, and water into a microwave-safe bowl. Stir until smooth (It does not have to be perfect. Some lumps are okay.). Cover the bowl with plastic wrap and microwave for one minute. Stir, cover, then microwave for an additional minute. Stir, cover, and then microwave for an additional 30 seconds.
Roll The Mochi Dough: Place a piece of parchment paper (or a nonstick silicone pastry mat) onto your work surface. Dust it with a layer of cornstarch. Scrape the mochi dough onto the parchment paper (be careful, it is HOT!).
Dust the top of the mochi with corn starch. Dust a rolling pin with corn starch. Use the rolling pin to roll the mochi dough into a rectangle. Roll even until it is ½ inch thick (1.3 cm). Dust with cornstarch repeatedly to prevent sticking.
Refrigerate The Mochi: Cover and place the parchment paper with the mochi into the refrigerator to cool for 20 minutes.
Fill The Dough: Use a round cookie cutter (about 3 inches) to cut circles in the dough. Pick up one circle of mochi and gently dust off the cornstarch from the top. Place one frozen Nutella ball in the center of the mochi and gently press the dough around it. Pinch the edges of the mochi to seal it. Place the mochi (seam side up) in plastic wrap bringing the corners to the center and twisting tightly at the top to seal it.
Video
Notes
Check Out My Blog Post for the helpful recipe video.
Swap the Filling: Instead of Nutella, you can fill the center with chocolate, red bean paste, ice cream, peanut butter, or fresh-cut strawberries.
How To Store: Place the Nutella Mochi in an airtight container and put it in the refrigerator. It will last 1-2 days. You can also freeze mochi, which will last up to two weeks.