Vegetarian Spinach and Mushroom Enchiladas
Ingredients:
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3 tablespoons butter
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1 pound mushrooms, cleaned and sliced
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1 cup coarsely chopped onion
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8 ounces fresh spinach - washed, stemmed, and coarsely chopped
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salt and ground black pepper to taste
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1 (10 ounce) can Mexican-style diced tomatoes with lime and cilantro (such as Rotel®), half drained
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1 (8 ounce) package neufchatel cheese
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1 (16 ounce) container sour cream, divided
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½ teaspoon ground cumin
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20 corn tortillas
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1 pound shredded Monterey Jack cheese
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1 (8 ounce) jar salsa, or as needed