Gather ingredients. Preheat the oven to 375 degrees F (190 degrees C). Line a baking pan with aluminum foil.
2
Crack egg into a baking dish. Add white sugar, espresso, and vanilla extract. Whisk to combine. Place bread slices into the dish and toss in the mixture to saturate; let sit for 10 to 15 minutes to fully absorb.
3
Transfer bread slices to the prepared pan and drizzle any accumulated coffee mixture liquid over top.
