In a large bowl, whisk the eggs, almond milk, vanilla extract, ground cinnamon, nutmeg, and salt until well blended.
Dip each bagel half into the egg mixture for about 30 seconds per side to let them soak.
Heat a nonstick skillet over medium heat and add the butter. Place the soaked bagel halves in the pan and cook for 2 to 3 minutes per side until they are golden brown and crisp.