Spray a light-colored, flat cookie sheet with non-stick cooking spray. Place a frozen millet bread dough loaf onto the cookie sheet. Cover loosely with a towel, then place in a warm, draft-free area. Allow to rise fo 6-8 hours, or until completely thawed. Spray plastic wrap with cooking spray and lay over the thawed dough, gently pushing down until the thawed dough is approximately one inch thick. Remove plastic wrap.

Preheat oven to 375°F. Bake for 30-35 minutes in the middle of the oven. Cover loosely with aluminum foil if bread starts to brown too much. Remove from oven and brush extra-virgin light olive oil onto the bread. Sprinkle with rosemary and sea/kosher salt. Return to oven and bake an additional 10 minutes. Allow to cool on a rack a little before slicing; the bread will flatten out again as it cools.