What a great collection of ideas! If you have a round baking dish and a square piece of parchment you can fold opposite corners of parchment diagonally towards each other to form a triangle. Repeat folding to keep the triangle long but narrower each fold, 4 or 5 times. The point can be held at center bottom of round baking dish to measure outside edge and mark with pencil where to trim with a scissor. a remarkably good fit will result. Once lightly coated with cooking spray the folds settle down well.

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