Whisk together ingredients in a large bowl and transfer to an airtight container.
Whisk together mix with 1 1/4 cups water, the eggs, and 2 tbsp. oil in a large bowl until mostly smooth.
Heat a large cast-iron skillet over medium heat and grease with 1/2 tbsp. oil. Ladle 1/3-cup portions of batter into skillet, working in batches and adding 1 tsp. oil to skillet in between. Cook, turning once, until pancakes are golden brown on each side and cooked through, about 5 minutes total.