Preheat your oven to 350°F (175°C) and prepare muffin pans by greasing them.

In a medium saucepan, combine butter, whole milk, and granulated sugar over low to medium heat until melted and smooth.

In a large bowl, whisk the eggs, then add pumpkin puree, flour, baking powder, pumpkin pie spice, and salt; mix until smooth.

Gradually pour the warm butter and milk mixture into the pumpkin mixture, stirring gently to combine.

Pour the batter into muffin pans, filling each compartment about two-thirds full and bake for 25 to 30 minutes.

Cool the Pumpkin Queijadas in the pans for 10 minutes, then invert and cool completely on a wire rack.