If you’re making your own oat flour, blend oats until very fine and measure out 3 cups oat flour after blending.
In a large bowl, whisk together 1½ cups almond milk, 4 eggs, ¼ cup light olive oil, ¼ cup maple syrup, 2 teaspoons vanilla, and 2 teaspoons apple cider vinegar until smooth.
Add 3 cups oat flour, 1½ tablespoons baking powder, and 1 teaspoon salt. Whisk until fully combined and no dry spots remain. Let the batter rest for 10 minutes so the oat flour can absorb the liquid.
Heat a non-stick skillet or griddle over medium-low heat and lightly grease if needed.
Scoop about ⅓ cup batter per pancake and gently spread into a circle. Cook until bubbles form on the surface and the edges look set, then flip and cook until golden and cooked through.
Repeat with the remaining batter, adjusting the heat as needed to prevent over-browning.
Serve warm with your favorite toppings, or let the pancakes cool completely and store for later. These pancakes reheat well in the toaster or microwave.