Yes, you can use other flours, but it will change the texture and nutritional content. Coconut flour or oat flour are good alternatives for gluten-free options, but keep in mind that coconut flour is more absorbent, so you may need to adjust the liquid content.

Absolutely. You can use other sugar substitutes like stevia or monk fruit sweetener. If you're not avoiding sugar for dietary reasons, regular sugar or maple syrup can also be used, but this will increase the carbohydrate and sugar content.

Yes, frozen blueberries can be used. However, add them to the batter while still frozen to prevent them from coloring the entire batter. Also, be aware that frozen blueberries may slightly increase the baking time.

Store the muffins in an airtight container at room temperature for up to 2 days or refrigerate for up to a week. They can also be frozen for up to 3 months. Just thaw overnight in the refrigerator or warm up briefly in the microwave.

Yes, they are made with low-carb almond flour and erythritol, a sugar alcohol that doesn't spike blood sugar levels like regular sugar. However, it's always recommended for individuals with diabetes to consult with their healthcare provider regarding their diet.