Preheat your oven to 375°F (190°C) and line a large baking sheet with parchment paper.
Pour the water into a saucepan and add the sugar, bring to a boil, then reduce to simmer and cook for another 4-5 minutes.
Remove from the stove and pour the syrup into a side bowl, set it a side to chill for 10 minutes. It should be warm but not hot.
Dip the brioche slices into the syrup on both side. Dip for no more than 2 seconds.
Gently squeeze the slice over the bowl to remove any access syrup, them place it over the prepared pan.
Top each slice with 2-3 tablespoons of the almond cream at the center.
Use an offset spatula, or the back of a spoon to spread the cream over the slice, making sure to leave about 1/2-inch gap between the cream and edges of the brioche. (The cream will spread as it bakes).
Sprinkle each slice with the slice almonds.
Bake for 12 minutes, then reduce the temperature to 350°F (180°C), for additional 10-15 minutes, until the almond cream is golden brown.
Remove from the oven, and let the pastries set and cool for 10-15 minutes.
Dust with the powdered sugar and serve.
Store at room temperature for up to 3 days, or refrigerate for up to one week. Reheat at a 300°F (150°C) preheated oven for about 10 minutes for a refresh texture.