Tostadas with Creamy Roasted Poblanos and Corn
['10 poblano chiles', '2 ears of corn, husked', '2 tablespoons vegetable oil', '1 large white onion, thinly sliced', '1 teaspoon kosher salt, plus more to taste', '1/4 cup crema (Mexican salted cream) or sour cream', '16 small corn tortillas or store-bought crispy tostada shells', 'Vegetable oil (for frying; if needed)', 'Kosher salt (if needed)', '1 1/2 cups Creamy Black Bean Spread (optional)', 'Shredded iceberg lettuce, thinly sliced white onion, queso fresco, cilantro leaves with tender stems (for serving)', 'A candy or deep-fry thermometer']
Preheat broiler. Arrange chiles in a single layer on a rimmed baking sheet. Broil, turning once, until blackened in spots, about 15 minutes. Transfer chiles to a large bowl, cover with plastic wrap, and let steam 15 minutes. Peel, seed, devein, and thinly slice chiles lengthwise.
Meanwhile, prepare a grill or grill pan for medium-high heat. Grill corn, turning occasionally, until kernels are tender and charred in spots, 15–20 minutes. Let cool, then cut kernels off cob.
Heat oil in a large skillet over medium. Add onion and cook, stirring occasionally, until light golden and tender, 10–12 minutes. Reduce heat to low, add chiles, corn, and 1 tsp. salt, and cook, stirring occasionally, until warmed through, about 2 minutes. Stir in crema and just heat through (do not bring to boil)-vegetables should be just coated; add more crema if needed. Season with salt.
If frying tortillas, fit a large skillet with candy or deep-fry thermometer; pour in oil to measure 1". Heat over medium-high until thermometer registers 375°F. Fry tortillas in batches until crispy, turning every 30 seconds, about 2 minutes total. Drain on paper towel-lined baking sheets and season with salt.
Spread 1 Tbsp. Creamy Black Bean Spread, if using, on a tostada shell. Top with 1/4 cup rajas, then lettuce, onion, queso fresco, and cilantro. Repeat with remaining tostada shells. Serve at room temperature.
Rajas can be chilled for up to 1 day. Reheat and let cool to room temperature before serving.
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