Make the streusel topping: Mix brown sugar, white sugar, and flour together with a fork. Stir in melted butter and mix until clumps form. Set aside.
Make the muffins: Preheat the oven to 350 degrees. Line muffin tin with liners.
Combine flour, cinnamon, nutmeg, ginger, allspice, baking soda, and salt in a mixing bowl; set aside.
In a large mixing bowl, whisk eggs well. Add Little Brainiac Organic Apple Pumpkin Cinnamon Fruit & Veggie Blend, then whisk in sugar and pumpkin until combined.
Add dry ingredients to the Little Brainiac Organic Apple Pumpkin Cinnamon Fruit & Veggie Blend mixture. Stir just until combined. Fold in apples. Do not overmix.
Fill muffin tin with batter almost to the top. Sprinkle with streusel mixture.
Bake for 20-25 minutes or until a toothpick inserted into the middle comes out clean. Let cool.
Make the glaze: In a bowl, whisk together sifted powdered sugar and enough milk to thin the glaze to your desired consistency for drizzling.
Using a spoon, drizzle glaze on cooled muffins and let set.