Read the rules carefully and follow them to the letter. Recipes should be unique. The recipe should be yours and yours alone. Entering can be done online or by mail. There are websites which show various recipe contests using various ingredients or even one ingredient used creatively. Good luck!
Some of the top recipes have been peanut butter cookies, cheesecake, pineapple upside cake, other cakes, and of course pies. There are several websites where you can enter your recipes.