Gluten Free Blueberry Streusel Muffins or Coffee Cake

Name: Gluten Free Blueberry Streusel Muffins or Coffee Cake
Ingredients: ½ cups Earth Balance Butter, Softened; ¾ cups Blanched Almond Flour; ½ cups Brown Sugar Or Sucanat; 2 teaspoons Ground Cinnamon, Divided; ½ cups Gluten Free Quick Cooking Oats; ½ cups Chopped Pecans (or Walnuts); 1 box (15 Oz. Size) Your Favorite Gluten Free Yellow Cake Mix Plus Additional Required Ingredients Specified In Mix Package (typically Water, Eggs, And Butter), Prepared But Not Baked; 1-½ cup Frozen Blueberries; 1 Tablespoon Cornstarch Or Arrowroot Flour