3 servings olive oil cooking spray
1/4 cup all-purpose flour
1/4 tsp garlic powder
1/8 tsp dry mustard
1/4 tsp table salt
2 large Spanish onions, sliced 1/4"-thk rounds, and separated into rings
1/2 cup buttermilk
1 cup seasoned bread crumbs
Preheat oven to 400 degrees. Coat a large baking sheet with cooking spray.
In a large bowl, combine flour, garlic powder, dry mustard and salt. Add onions and toss to coat.
Pour buttermilk into another large bowl, add onions and toss to coat (use your hands for the best result).
Place bread crumbs in another large bowl, add onions and toss to coat. Transfer onions to prepared baking sheet and spray with cooking spray.
Bake until golden brown, about 35 minutes. Serve hot.