I saw these Ice Cream Sundae Cookie Cups on Pinterest quite awhile ago, and thought I'd give them a try. I wanted really easy, so I used prepared cookie dough from the refrigerated section at the store. I cut the roll of cookies into 12 equal slices, and placed a slice in each cup of a regular size muffin tin and baked at 350̊ till golden around rim but still somewhat soft in the middle (about ten minutes). Removed from oven and immediately used a small spice jar to push down the center into a bowl shape. Cooled for ten minutes, then twisted gently to remove from the muffin cup. I used a paring knife to loosen some...they stick a little if you leave them in the pans too long. Let the cups cool thoroughly.
edit: I couldn't find my ice cream scoop, but that would have simplified things a great deal. While the cookie bowls were baking, I placed scoops of ice cream onto a cookie sheet, and placed the sheet in the freezer to to keep them firmly frozen until the cookie cups were baked, cooled, and ready to be filled with them. You have to work pretty quickly.