Activate the Yeast: In a small bowl, combine the warm water or milk with the honey or molasses (if using). Sprinkle the yeast over the liquid and let it sit for about 5-10 minutes until it becomes frothy.
Mix the Dry Ingredients: In a large mixing bowl, combine the rolled oats, flour, and salt.
Combine the Ingredients: Pour the activated yeast mixture into the dry ingredients. Add the olive oil or melted butter if using.
Knead the Dough: Mix the ingredients until a dough forms. Transfer the dough to a lightly floured surface and knead for about 5-7 minutes until the dough is smooth and elastic.
First Rise: Place the dough in a greased bowl, cover it with a clean kitchen towel or plastic wrap, and let it rise in a warm, draft-free place for about 1-2 hours, or until it doubles in size.
Preheat the Oven: While the dough is rising, preheat your oven to 375°F (190°C).
Bake the Bread: Once the dough has risen, place the loaf pan in the preheated oven and bake for 30-35 minutes, or until the bread is golden brown and sounds hollow when tapped on the bottom.
Cool and Serve: Remove the bread from the oven and let it cool in the pan for 5-10 minutes. Then, transfer it to a wire rack to cool completely before slicing and serving.