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Split each 2 inch slice of bread in half, without fully cutting though, forming a pocket.
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Spread a heaping spoonful of mascarpone inside the pocket and sprinkle with a handful of blueberries.
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In a medium bowl, whisk the eggs, milk, cinnamon, vanilla and salt until well blended.
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Melt a tablespoon of butter into a large nonstick pan over med/high heat.
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Take a piece of the stuffed french toast and dip it into the egg mixture, turning it to make sure all of the bread is soaked.
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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 (you'll need to cook it in batches).
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Sprinkle the tops of the bread with a little sugar while it cooks (about 2-3 mins) and carefully flip it over to cook on the other side, about 2-3 mins more.
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Add a little more butter to the pan and cook the remaining slices.
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Sprinkle with powdered sugar if desired and serve with syrup.