Prepare the Sriracha Mayo by whisking together mayonnaise, Sriracha, salt, garlic powder, and onion powder in a small bowl. Set aside.

Set up the dredging station with all-purpose flour on a shallow plate.

Make the batter by combining the remaining flour, cayenne pepper, cumin, black pepper, salt, garlic powder, and onion powder in a large bowl. Gradually stir in beer until smooth.

Heat the vegetable oil in a Dutch oven over medium-high heat until it reaches 375°F.

Dredge green beans in flour, then dip in batter, and fry in batches for 2-3 minutes until golden brown.

Drain on paper towels and serve warm with Sriracha mayo.