Preheat the oven to 425°F (220°C). Line a baking sheet with a wire rack and lightly spray the rack with nonstick spray.
Set up a dredging station with three shallow bowls: flour in the first, beaten eggs in the second, and panko plus seasoned fine breadcrumbs combined in the third.
Season the chicken tenders all over with kosher salt, black pepper, and garlic powder.
Dredge each tender in flour, shaking off excess, then dip into the beaten eggs, and press into the breadcrumb mixture so the coating adheres. Place coated tenders on the prepared wire rack.
Bake the chicken for 12 minutes, carefully flip each piece, then bake 8–12 minutes more until golden and cooked through (internal temperature 165°F/74°C).
While the chicken bakes, combine brown sugar, buffalo wing sauce, butter, and water in a small saucepan over medium heat. Whisk until the sugar dissolves, bring to a brief boil, then reduce to a simmer and cook for 2 minutes. Remove from heat and let cool slightly.
When the chicken is done, use a spatula or tongs to transfer the tenders to a bowl or plate. Drizzle the warm sticky sauce over the chicken and gently toss to coat, then serve immediately to preserve the breading.
Make the yogurt blue cheese sauce by mixing Greek yogurt, lemon juice, a big pinch of kosher salt and black pepper, crumbled blue cheese, and sliced green onions; mash the cheese slightly while stirring and serve immediately.