Heat a griddle to 350°F to 375°F, greasing it if necessary.
In a shallow bowl, whisk together eggs, milk, sugar, vanilla extract, cinnamon, and salt until smooth.
Spread 2 tablespoons of creamy peanut butter onto 6 slices of brioche. Spread 2 teaspoons of jam onto the remaining 6 slices of brioche.
Assemble 6 sandwiches by pairing a slice spread with peanut butter with a slice spread with jelly.
Dip each sandwich into the egg mixture, ensuring all sides are coated but not soaked. Place the coated sandwich on the griddle and cook for 2-4 minutes on each side, or until golden brown.
Serve with your favorite toppings like maple syrup, creamy peanut butter, or fresh fruit.