Combine streusel ingredients in a small bowl and set aside.
In a large mixing bowl, whisk together dry ingredients, set aside. Add remaining ingredients to a medium mixing bowl, stir until combined. Pour wet ingredients into dry and stir just until moist.
Line muffin tin with paper cup holders or mist with nonstick cooking spray. Fill tins to 2/3 full, add approximately 1 teaspoon streusel to the top of each muffin. Bake 15-17 minutes or until a toothpick inserted in the middle comes out clean and muffins are golden.