Preheat an oven to 400ºF (205°C) or an air fryer to 375ºF (191°C). In a medium bowl whisk yogurt, egg, maple syrup, and cinnamon.
Using your fingers or the back of a spoon, press into the center of the bread to indent and create a well without tearing. Fill with custard mixture, dividing evenly between the slices. Top the custard with a mix of berries.
If using an oven: Place prepared bread slices on a baking sheet and bake until the custard is set and the bread is golden brown, 10 to 13 minutes.
If using an air fryer: Carefully place the prepared bread slices in the basket of your air fryer and cook until the custard is set and the bread is golden brown, 7 to 10 minutes.
Brew the coffee. Refrigerate to cool.
Dissolve the honey in milk.
Pour the coffee over ice and stir in the milk and honey. Sprinkle with sea salt on top.
Serve the yogurt toast with salted honey latte.