Step 1

In a small bowl, mix together filling ingredients and set aside.

Step 2

In a separate bowl, add the streusel ingredients. With clean hands, mix together, squeezing to form clumps until all ingredients are incorporated in clumps. Set aside until ready to top the muffins

Step 3

Preheat the oven to 425ºF. Line a 6-cup jumbo muffin pan with liners or spray with nonstick spray and set aside. If making standard sized muffins, line a 12-cup muffin tin with paper cupcake liners or spray with nonstick cooking spray. Set aside

Step 4

In a large mixing bowl, whisk together flour, baking powder, salt and cinnamon. Set aside.

Step 5

In a separate large bowl, mix together with a wooden spoon the vegetable oil, brown sugar, eggs, milk and sour cream until well incorporated.

Step 6

Gently fold in the dry ingredient mixture until no dry spots of flour are left.

Step 7

If using a jumbo muffin tin, add ¼ cup muffin batter to the bottom of each muffin cup. If using a standard muffin tin, add 2 tablespoons of muffin batter. Add 2 teaspoons of the filling for jumbo, 1 teaspoon for standard, then top with ¼ cup more muffin batter (2 tablespoons for standard)

Step 8

Sprinkle muffin batter generously with streusel topping, dividing it evenly among the muffins

Step 9

Bake for 5 minutes at 425ºF, then lower the oven temperature down to 350ºF for another 15 minutes for standard muffins and 18-20 minutes for jumbo, or until a toothpick inserted into the center of the center muffin comes out clean.

Step 10

Allow to cool in muffin tins for 10 minutes, then transfer to a wire rack to cool completely.

Step 11

In a small bowl, mix glaze ingredients together and drizzle on top prior to serving