In the photo above you can see three ways to make molds for paper pastry and chocolate cases in dolls house scale.
Shaping Silicone Putty Molds on Electrical Marettes - Using Two part silicone mold putty you can make a flexible mold which makes it slightly easier to remove the paper case for your dolls house miniatures. To make these molds you will need mold putty and a small electrical marette (or another suitable sized fluted shape). Marettes are used wherever two electrical wires are joined together. You will find them in a range of sizes in hardware and electrical stores. Try the smallest marettes first to make sure a 1/2 inch paper circle will make a case. To make the mold, mix a small amount of putty into a ball following the directions for your putty. Press the ball gently onto a flat surface and insert the closed top of the marette as shown above. Depending on the size of case you wish to make, you will need 1/4 of an inch of marette at a minimum, covered with putty. Level off the top of the putty as much as possible and press it tightly to the marette. Leave to set. Carefully mark a line on the edge of the mold using an indelible marker and carry the line onto the marette. (see photo above). This will help you line up the marette and the mold when it comes time to shape the pastry case. Carefully remove the marette (and keep it with the mold).
Shaping Polymer Clay Molds on Electrical Marettes - You can use a similar method to make molds from polymer clay. You will need a marette as in the first method, but you mix a ball of waste polymer clay, coat your marette with a release agent (corn starch or talcum /baby powder), shake off the excess powder, and carefully press the marette into the clay, trying to push it into place without wiggling it from side to side. Hold the polymer clay in place on your baking tile or tray with tweezers across the top of the clay, while you pull the marette straight out of the clay to leave a clear impression behind. If you wish you can mark the unbaked clay and the marette with a match line as for the silicone putty method above. Bake the clay according to directions for your particular brand. See the next step for shaping the paper circles into fluted cases.
Making Molds For Smaller Cases Without Marettes - To make smaller scale pastry cases or cases for chocolates and candies, you will need to first carve the fluted shape. You can carve fluted lines in the end of a narrow wooden cylinder, a 1/8 inch cylinder made of epoxy putty, or a cylinder made of polymer clay. Roll out enough clay or epoxy putty to leave a handle you can hold the tool with, or leave one to two inches as a handle on the wood cylinder you will carve. If you are carving polymer clay or epoxy putty, harden the cylinders and then use a craft knife or a polymer clay knife to carve in fluted lines (see the sample above with the chocolate cases). Once you have the fluted tool, make a mold from putty or polymer clay for the other half.