Preheat the oven to 400°F.
Rinse the fruit. Let the fruit dry on a paper towel while preparing the recipe. Dice up the strawberries.
1 cup mixed berries
Mash the bananas in a small bowl and set them aside.
3 ripe bananas
In another bowl, using a pastry blender or the back of a fork, whisk together the flour, sugar, butter, baking powder, salt, and cinnamon.
2 ½ cups all-purpose flour, ¾ cup brown sugar, 1 tablespoon baking powder, ¾ teaspoon salt, ¾ teaspoon ground cinnamon, 6 tablespoons butter
Add the eggs into a large bowl, beating well. Add in the milk, vanilla extract, and mashed bananas. Mix well.
3 ripe bananas, ⅓ cup milk, 1 teaspoon vanilla extract, 2 eggs
Slowly add the dry ingredients to the wet ingredients. Mix just until everything is combined.
Using a spatula, gently fold the berries into the muffin batter.
1 cup mixed berries
Place batter into lined jumbo muffin cups. Fill the muffin cups ½ - ¾ full.
Place a few berries on top of each muffin before baking.
For the topping, combine ¼ cup brown sugar and ½ teaspoon ground cinnamon. Sprinkle a little on the tops of each muffin before baking.
¼ cup brown sugar, ½ teaspoon ground cinnamon
Bake for 25 minutes.
Let cool slightly before serving.