Start by mashing the center of the thick-sliced bread to create a shallow center.
In a bowl, mix together the Greek yogurt, honey, vanilla extract, and lemon zest until well combined.
Spread the custard mixture generously over the hollow of the bread slices.
Top the custard with fresh blueberries, then bake on a wire rack at 350 for 20 minutes until the bread is toasted and the custard is set.
