Preheat the oven to 350°F (175°C) and grease a muffin tin.

In a mixing bowl, combine the mashed sweet potatoes, brown butter, granulated sugar, eggs, and vanilla extract. Mix until smooth.

In another bowl, whisk together the flour, baking powder, baking soda, salt, and cinnamon.

Gradually add the dry ingredients to the wet ingredients, stirring until just combined.

In a separate bowl, beat together the cream cheese, powdered sugar, and vanilla extract until smooth.

Spoon a layer of muffin batter into each muffin cup, followed by a dollop of cream cheese filling, then top with more muffin batter.

Bake for 20-25 minutes or until a toothpick inserted into the center comes out clean.

Allow to cool in the pan for 5 minutes before transferring to a wire rack to cool completely.