Whisk together all batter ingredients until smooth and fully combined.
Dip each brioche slice in the batter until fully coated, about 10 seconds or longer depending on your bread.
Heat a nonstick pan over medium and add butter. Once it foams, add the bread slices and lower to medium-low.
Cook for about 6 minutes without disturbing. Flip once and cook the second side for 3–4 minutes until golden.
Serve with butter, maple syrup, and fruit preserves or fresh berries.