Preheat the oven to 350°F (175°C) and grease the loaf pan with butter or cooking spray.
In a mixing bowl, combine the cottage cheese, milk, egg, and melted butter. Whisk until well combined.
In a separate bowl, mix together the flour, baking powder, baking soda, salt, and sugar.
Gradually add the dry ingredients to the wet ingredients, stirring with a wooden spoon or spatula until just combined. Do not overmix; a few lumps are okay.
Pour the batter into the prepared loaf pan, smoothing the top with a spatula.
Bake in the preheated oven for 30 minutes, or until the top is golden brown and a toothpick inserted into the center comes out clean.
Remove the bread from the oven and allow it to cool in the pan for 10 minutes, then transfer it to a wire rack to cool completely before slicing.
Optionally, add herbs or spices to the batter for extra flavor, such as garlic powder or mixed herbs.
Store any leftovers in an airtight container for up to 3 days. It can also be toasted or frozen for later use.