Preheat oven to 375°F. Line a baking sheet with foil; coat with cooking spray. Whisk vegetable oil, hot sauce, 2 Tbsp. sugar and salt to taste in a bowl; add pecans and toss to coat. Spread on prepared sheet. Bake until sugar bubbles and pecans begin to brown, 3 to 5 minutes. Cool to room temperature on a rack.
Chop just enough peach slices to make 1/2 cup and puree with vinegar, olive oil, mustard, onion, 1 Tbsp. sugar, and salt and pepper to taste in a blender.
Divide greens among 8 salad plates; top with peaches, dressing and pecans.