Preheat the oven to 350°F (175°C) and lightly grease a 9x13-inch baking dish.
Spread the chopped croissants evenly in the prepared baking dish and scatter 3 to 4 cups of sliced strawberries over them.
In a large bowl, whisk together almond milk, beaten eggs, maple syrup, strawberry preserves if using, vanilla extract, cinnamon, nutmeg, allspice, and sea salt.
Pour the custard mixture evenly over the croissants, gently pressing down so the bread absorbs the liquid. For deeper flavor, cover and refrigerate for 30 minutes to overnight (optional).
Bake uncovered for 40 to 50 minutes, until the top is golden and the center is set but still slightly soft. Let cool 10 minutes before serving.
To make the strawberry topping, combine fresh strawberries, organic cane sugar, filtered water, and lemon juice in a small saucepan.
Simmer over medium heat for 8 to 10 minutes, stirring occasionally until slightly thickened. Let cool slightly before serving.
Dust the baked French toast with powdered sugar, spoon warm strawberry topping over each serving, and add a dollop of whipped cream.