The secret to the best French toast is properly soaking the bread in a quick custard made with whole milk, which infuses it with creamy flavor and adds protein to keep you fueled throughout the day.
1. In a 9x9-inch dish (or similar), whisk together the milk, maple syrup, vanilla extract, cinnamon, and salt. Add the eggs and whisk until evenly combined.
2. Add 3 slices of challah (or as many fit in a single layer) and soak for 2 minutes, then flip with tongs, and soak for 2-3 more minutes until fully saturated, but not falling apart.
3. In a large pan preheated over medium heat, melt 2 Tbsp butter. Add the French toast and cook for 2-3 mins per side until golden brown. (You can soak the remaining slices while the first batch cooks.) Repeat with the second batch, adding more butter to the skillet if needed.
4. Transfer to plates and serve with butter, maple syrup, and berries. Enjoy!