Preheat the oven to 300°F (150°C). Cut the bread into large cubes and transfer to a baking sheet. Toast in the oven for about 5 minutes.
Cut the fresh strawberries into smaller pieces.
Grease a 2-quart (2 liters) baking dish with butter.
Add a layer of bread cubes, then spread half of the strawberries over them.
In a bowl, whisk eggs, sugar, salt, vanilla extract, and cinnamon. Gradually add milk and cream, then pour the mixture over the bread cubes.
Press with a spatula to coat the bread, then add the remaining strawberries and let it rest for 10-15 minutes.
Preheat the oven to 350°F (180°C) and bake for 35-40 minutes until golden and puffed. Let cool for 10 minutes before serving with powdered sugar and whipped cream or ice cream. Enjoy!