Spray 12 cup muffin tin with baking spray and Pre-Heat oven to 375F.
Combine 1 cup of flour, ½ cup cornstarch, ¼ cup sugar and 1 teaspoon of baking powder in a large bowl. Whisk to break any lumps and mix well.
In a separate smaller bowl whisk together the egg, ½ cup of milk and ¼ cup of butter. Making sure all 3 ingredients are at room temperature. Mix well.
Add the wet ingredients to the dry. Mix lightly to make a dough. Don't over mix so that your dough stays nice and light.
Add the cubed Saba into the dough and mix it in lightly. Divide the Maruya dough equally into each cup. Bake in the oven for 17 minutes at 375F.
Once the Maruya is baked take it out of the oven and turn the broiler on to 500F.
While it is heating up, brush the fritters with butter. Use up all the butter soaking up the Maruya. Then top with sugar.
Place the Maruya under the broiler for 1-2 minutes until the tops are golden brown. Don't walk away here and keep a close eye on it, so that it doesn't burn.
Turn off the broiler and take the fritters out of the oven. Leave to rest in the pan for 5 minutes.
Then transfer to a wire rack to cool down slightly for another 5 minutes.
Place on a serving platter and serve right away.