Gluten Free Blueberry Streusel Muffins

Name: Gluten Free Blueberry Streusel Muffins
Prep time: 15 min
Cook time: 27 min
Total time: 42 min
Cuisine: European, German
Ingredients: 1/3 Cup Gluten Free 1-to-1 Flour Blend (I use Bob's Red Mill); 1 Tablespoon Light Brown Sugar; 1 Tablespoon Sugar; Pinch of Salt; 2 Tablespoons Vegan Butter (melted); 17 Tbsp Gluten Free 1-to-1 Flour Blend (1 C + 1 Tbsp); 1 teaspoon Baking Powder; 1/2 teaspoon Salt; 1/2 Cup Sugar; 1 Egg; 3 Tablespoons Light Olive Oil; 6 Tablespoons Non-Dairy Milk (non dairy or regular); 1/2 teaspoon Vanilla; 1 Cup Fresh Blueberries (divided)