Preheat oven to 375 F
Add butter, egg, milk, sourdough discard & sugar to a bowl.
1/3 cup Melted Butter, 1 Egg, 2/3 cup Milk, 1/2 cup Sourdough Discard, 3/4 cup Sugar-Maple/Cane/ Coconut OR Maple Syrup
Mix ingredients very well.
On top of your wet ingredients, add flour, baking powder, salt.
1 1/2 cup Flour, 2 tsp Baking Powder, 1/4 tsp Salt
Mix together gently.
If using frozen berries, toss them lightly in a bit of flour.
1 1/2-2 cup Fresh or Frozen Blueberries
Add blueberries to batter, and fold in gently.
Line or grease a muffin tin.
Divide batter evenly amongst muffin tin, they should be about 2/3's full.
Mix together streusel topping ingredients, should be a crumbly mixture.
1/2 cup Flour, 1/2 cup Sugar, 1/4 cup Melted Butter
Press 1-2 tbsp of the streusel mixture onto the top of each muffin.
Bake for 29-30 minutes. You can insert a toothpick and it should come out clean when ready, or gently press with finger on the top of a muffin and they should bounce back when ready.