To prepare a strawberry chocolate chip muffins with chocolate streusel topping recipe, first you'll need to prepare the muffin batter. First, mix the flour, baking powder, sugar, and salt together. Then, add the wet ingredients to the dry ingredients and mix until they're just combined. Next, pour the batter into muffin tins and bake for 18 to 20 minutes or until the toothpick inserted in the center comes out clean.