Preheat oven to 340 F or boil water to prepare the steamer. Also grease a Pyrex 4 cup round container with oil (spray oil works fine, too).
In a clean bowl, mix glutinous rice flour (mochiko flour) with tapioca flour and sugar. Set aside.
Heat almond milk in a microwave safe bowl or glass measuring cup until hot, about 2 minutes. (This is an optional step to make the mochi chewier. Read notes**)
Pour the hot almond milk into the flour-sugar mixture and use a whisk to mix well.
Stir the creamy peanut butter spread into the batter
Add the roasted peanuts to the batter
Pour batter into a GREASED pyrex glass round container and steam on medium heat for 40 minutes, or until the center of the mochi cake is set. Alternatively, you can also bake the mochi cake in the oven - 340F for 40 minutes, or until the middle is set and the edges are crispy.
Let cool completely before serving, or cool the cakes in the freezer for 1-2 hours which helps to get clean slices of cakes.
Fry the sliced mochi cakes in oil if desired. Enjoy!