In a large mixing bowl, stir together the almond flour, sweetener, and baking powder until well combined. Stir in 1 egg yolk, the almond milk, and vanilla. (Reserve the other egg yolk for another purpose) Set aside the batter.
In a small mixing bowl, beat the egg whites using a hand mixer until stiff peaks form. Fold the whites into the pancake batter. Let the pancake batter sit for 5 minutes to thicken.
Grease a nonstick griddle or large nonstick skillet with cooking spray or oil and heat over medium heat. Pour ¼ cup portions of the batter into the skillet or on the griddle and let cook until bubbles start to form on the edges, about 3 minutes, then carefully flip and continue cooking until slightly golden, about 2 minutes. Repeat with the remaining batter. Serve with your favorite keto toppings (I like butter and sugar-free syrup).