Beat the butter and panela together in a bowl until fluffy. Stir in the eggs and vanilla.
In a separate bowl, combine the dry ingredients. Then add to the wet ingredients, a bit at a time. When the dough gets too hard to stir, gently knead together with clean hands.
Combine the topping ingredients in a small bowl. Roll the dough into small balls (about 1 1/2 Tbsp of dough each). Then roll each ball in sugar.
Place the balls on a tray lined with parchment paper or silicone baking mats. Gently press them down to flatten and sprinkle a bit more of the sugar topping on top.
Bake the cookies at 375°F for 10 minutes. They will still look soft. Let them cool for 10 minutes, then transfer them to a plate or wire rack to finish cooling.