What is the most likely explanation for discolored and bitter-tasting biscuits?

There are a few likely explanations for discolored and bitter-tasting biscuits:

1. Overmixing: Overmixing gluten-containing dough, like biscuit dough, develops the gluten too much, resulting in tough, chewy biscuits. This can also lead to a slightly yellow or brown color due to the oxidation of fats and sugars.

2. Overbaking: Baking biscuits for too long can also result in a brown or even burnt color, as well as a bitter taste.

3. Old baking powder: Baking powder is a chemical leavening agent that loses its potency over time. Using expired or old baking powder can result in flat, dense biscuits, and also contribute to a slightly bitter taste.

4. Excess baking soda: If you used too much baking soda in the recipe, it can cause a bitter taste and yellowing in the biscuits.

5. Burnt butter: Using burnt butter in your recipe can lead to both a darker color and a bitter taste in the biscuits.

6. The type of butter: Some butters have a slightly stronger flavor than others, which can affect the taste of the biscuits, especially if you use a large amount.

7. Brown sugar: Brown sugar contains molasses, which can add a slightly bitter flavor to biscuits.

8. Milk or buttermilk: If the milk or buttermilk used in the recipe is old or has gone sour, it can also contribute to a bitter taste.

9. Reaction with the baking pan: If the baking pan is made of dark metal, it can cause the biscuits to brown more quickly and potentially develop a slightly bitter taste.

To prevent discolored and bitter-tasting biscuits, make sure to:

* Use fresh ingredients: Check the expiration dates on your baking powder and milk/buttermilk.

* Follow the recipe carefully: Pay attention to the amount of baking soda and baking powder used.

* Don't overmix the dough: Mix the dough just until it comes together.

* Bake at the correct temperature: Use a thermometer to ensure your oven is at the right temperature.

* Watch for signs of overbaking: Take the biscuits out of the oven when they are golden brown and have risen properly.

If you are unsure about the cause of the discoloration and bitter taste, you can try using a new batch of ingredients or a different recipe.