Sous Vide Buttermilk Fried Chicken - A Duck's Oven

Ingredients

• 1 cup buttermilk
• 1 tsp kosher salt
• 1 tsp garlic powder
• 1 tsp onion powder
• 1/2 tsp freshly cracked black pepper
• 1/2 tsp paprika
• 1/4 tsp cayenne pepper (optional)
• 1 1/2 lbs chicken pieces (bone-in or boneless; thighs, breasts, or wings)
• 2 large eggs
• 1 cup all-purpose flour
• 1/2 tsp kosher salt
• 1/4 tsp freshly cracked black pepper
• canola oil or other high-heat oil for frying
• kosher salt