Pour 2 Tbsp olive oil into heavy medium skillet and turn on heat to medium.
Chop onion into thin slices. Crush garlic cloves and chop finely. Add both to skillet. Saute, stirring frequently, until onion is soft and browned.
Add crushed coriander seeds and cumin to skillet and stir for about thirty seconds until spices release fragrance.
Add drained pinto beans and stir until heated. This should take less than a minute. If beans begin to stick to skillet, add an additional Tbsp of olive oil.
Add chopped spinach and stir until wilted, about one minute.
Season with freshly grated pepper to taste. Gently stir in 2 Tbsp queso sauce. Remove from heat and serve.
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