Chipotle Beef Tostadas

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2 tablespoons vegetable oil

1 pound ground beef chuck

1 large white onion, minced

Kosher salt

1 to 1 1/2 teaspoons chipotle chile powder

1 10-ounce can Mexican-style diced tomatoes with green chiles

1 15-ounce can pinto beans, drained

1 medium zucchini or yellow squash, diced

2 cups coleslaw mix or shredded cabbage

Juice of 1 lime, plus lime wedges for serving

Freshly ground pepper

8 tostadas (flat crisp tortillas) or taco shells

1 1/2 cups shredded cheddar cheese (about 4 ounces)