Mix okra, onion, salt, pepper, water, and beaten egg in a large bowl until combined.
In a separate bowl, whisk together flour, baking powder, and cornmeal.
Gradually stir dry ingredients into the wet mixture until just combined.
Heat vegetable oil in a skillet over medium heat.
Drop spoonfuls of batter into the hot oil. Fry for 2-3 minutes per side until golden brown.
Drain patties on paper towels and serve hot for the ultimate crispy treat.