Mash the bananas with a fork and mix with the 2 tablespoons sugar and 1.5 cups flour.
Whisk together the milk and egg, then stir in the banana mixture to form a batter. Set aside.
Mix together cinnamon and sugar to taste in a separate bowl and set aside.
Heat oil in a deep fryer or saucepan to 350 degrees Fahrenheit. (If in a saucepan leave on low heat once it reaches 350 degrees Fahrenheit)
Pour the batter 1.5 tablespoons at a time into the hot oil and fry for about 4 and a half minutes, turning halfway through cooking, until the donuts are golden brown.
Drain the sonhos on paper towels and serve dusted with the cinnamon and sugar to taste. Enjoy.