Crispy Oven Fried Chicken Sandwich

Ingredients

• 1 1/2 c buttermilk
• 1/4 c dill pickle brine
• 2 tsp. coarse sea salt
• 1 tsp. smoked paprika
• 1 tsp. garlic powder
• 1/2 tsp. ground black pepper
• 1 tbsp. avocado oil
• 1 tsp. hot sauce, optional
• 2 lb boneless skinless chicken thighs, or chicken breast
• 1 c all-purpose flour
• 1/2 c cornstarch
• 1 tsp. onion powder
• 1 tsp. mushroom umami seasoning
• 1 tsp. brown sugar, optional
• 1/4 tsp. cayenne pepper, or more to taste
• 1/2 tsp. avocado oil spray, plus more for greasing
• 1/2 c Greek yogurt
• 1 tbsp. dill pickle brine
• 1 tbsp. hot sauce, or more to taste
• 1 tsp. honey
• 1/2 tsp. garlic powder
• 1/8 tsp. coarse sea salt, to taste
• 1/8 tsp. smoked paprika, to taste
• 1/2 head leafy green lettuce, or iceberg lettuce
• 4 brioche hamburger buns
• 2 tbsp. butter, optional
• 4 dill pickle slices