The tangy creaminess of the mascarpone, the plump, juicy blueberries, the light and airy challah with a lightly sugared, crispy crust…this stuffed french toast is everything.
In a medium bowl, whisk the eggs, milk, cinnamon, vanilla and salt until well blended. Melt a tablespoon of butter into a large nonstick pan over med/high heat.
Sprinkle a little sugar on one side of the bread and place it, sugared side down, in the hot pan. Repeat with a couple more slices making sure the pan isn't too crowded.