In a Small, heavy skillet, heat 2 teaspoons of the oil over a medium flame. Crack the egg into the skillet, and sprinkle with salt and pepper. Cover and cook until the white is firm and the yolk almost set, about 4 minutes.
Meanwhile, toast the bread until golden brown. Brush the remaining 1 teaspoon of oil over the toast. Rub the garlic over the toast, then sprinkle with the Parmesan cheese. Spoon the drained marinara sauce over the Parmesan cheese and top with the cooked egg. Serve immediately.