Preheat your oven to 425°F (220°C). Slice the large yellow onion into 1/2 inch thick rounds and carefully separate the rings.
In a mixing bowl, whisk together the unbleached all-purpose flour, paprika, salt, ground pepper, ground cumin, and ground coriander until well combined.
Coat each onion ring in the flour mixture, shaking off any excess flour for a perfect crunch.
Line a baking sheet with parchment paper. Arrange the coated onion rings in a single layer and bake for 20-25 minutes, flipping halfway through, until golden brown and crispy.
While baking, prepare the cumin dipping sauce by whisking together heavy cream, corn starch, mayonnaise, sour cream, ground coriander, ground cumin, a splash of Tabasco sauce, and lemon juice until smooth and creamy.
Remove the onion rings from the oven and let them cool slightly. Serve warm alongside the cumin dipping sauce and enjoy!