I have researched other recipes similar to this and some people complain of the cookie wafers not fitting into the mini cup. When I placed the cookie in, round side down, it stretched out the liner a little but ended up working out just fine. If you find the mini wafers, use those. You could also break up the wafer or crush them in a food processor or plastic bag and sprinkle a little into the bottom.
If you use the sturdy mini aluminum liners you can place them directly onto a cookie sheet if you don't have mini muffin pans.
Recipe adapted from
AllRecipes