Preheat your oven (fan or convection if possible) to 325 Fahrenheit (160-165 Celsius).
Prepare a springform cake pan (9") by butter the inside walls and a little bit of butter on the bottom to hold the parchment round. Place the parchment round on the bottom of the pan. Set aside.
Using a food processor, combine the sugar and almond paste until evenly combined. Then add the butter (cut into rough cubes) and vanilla until slightly creamy and if the butter is very warm, it will be slightly fluffy. Add the eggs one at a time, pulsing in between each egg being added.
In a small separate mixing bowl, combine the dry ingredients, flour, salt and baking powder. Then add to the food processor with the wet ingredients. Pulse until all combine and resembles a lovely yellow batter.
Pour into the springform pan. Using a spatula, evenly spread the batter on the top, then place in the oven for one hour or until a knife placed in the center of the cake comes out clean. In my oven, it only takes 50 minutes, so begin checking around 45 minutes. This will not deflate the rising of the cake. You want the cake to remain slightly springy when you touch it, so be sure not to overt-bake it.
Remove from the oven and using the back-side of a butter knife, run the blade around the edges of the cake to make sure when you remove the springform component, everything stays in tact. Carefully remove the springform and then the bottom of the pan, leaving the parchment if you would like as it can be easily removed later.