To create a warm environment ideal to proof dough, preheat your oven to its minimum temperature (170 degrees, 200 degrees), but shut it off once the temperature reaches 110 degrees. Place your dough (in a greased bowl, covered with plastic wrap), on a baking sheet and in the oven. The oven temperature will drop when you open the oven door, but enough residual heat will remain that your dough should steadily rise.