Preheat & Prepare: Set the oven to 350°F. Lightly grease a 9×5-inch loaf pan to prevent sticking.
Heat & Soak Oats: In a medium saucepan over medium heat, combine honey, water, butter, and brown sugar. Stir occasionally and bring the mixture to a gentle simmer. Avoid boiling. Remove from heat, then stir in the oats. Let sit for 10 minutes to allow the oats to soften and absorb the flavors.
Mix Dry Ingredients: In a large mixing bowl, whisk together the flour, baking soda, salt, and cinnamon.
Combine Mixtures: Pour the cooled honey-oat mixture into the dry ingredients and stir gently until just combined.
Incorporate Egg & Bake: Add the beaten egg to the batter, stirring for about 30 seconds. Immediately transfer the batter into the prepared loaf pan, spreading it evenly. Bake for 45–50 minutes, or until a toothpick inserted into the center comes out clean.
Cool & Optional Glaze: Let the bread cool in the pan for 10 minutes before transferring it to a wire rack. For an extra glossy finish, brush the warm bread with additional honey, then place it on a baking sheet and bake at 400°F for 2 minutes to caramelize the glaze.