Preheat the oven to 425 degrees F. Spray both sides of each tortilla generously with oil, season with salt, and arrange in a single layer on a large baking sheet. Bake for 6 minutes, then flip and bake for 3 to 5 more minutes, until the tortillas are crispy.: As the oven warms to 425 degrees F , you will notice a toasty aroma filling the kitchen, a sign the oven is ready to transform the corn tortillas . The first six minutes allow the oil to heat and the edges to firm, then flipping ensures both sides achieve even browning and that signature brittle snap. Listen for a faint crackle as the moisture cooks away and watch for edges turning a pale gold before deepening, which means they are approaching the right texture. This dual bake method prevents soggy spots and yields uniform crispness, which matters because a limp base will undercut the salad's contrast. A common mistake is overcrowding the pan, which leads to uneven crisping; use a single layer and give each tortilla room to breathe.
In a large bowl, combine the cabbage, beans, jicama, avocado, radishes, onion, cilantro, cotija cheese, pepitas, salt, and pepper.: When you toss these components together you should feel the weight of the can of pinto beans and hear the crunch of shredded cabbage and diced jicama , promising texture variety. The contrast of creamy chopped avocado against crisp radishes and toasted pepitas creates an exciting mouthfeel. I like to add ingredients in stages so softer items like avocado don't get mashed by heavier ingredients, preserving their shape and creaminess. The bright green flecks of chopped cilantro add visual freshness, and the crumble of cotija cheese brings savory, slightly salty hits throughout the bowl. Be careful not to over-salt at this stage since the dressing and cheese will add sodium.
In a small bowl, whisk together the Greek yogurt, lime juice, cilantro, jalapeño, garlic, cumin, salt, and pepper.: As you whisk the dressing, the Greek yogurt should become smooth and glossy, with aromas of fresh cilantro and sharp garlic lifting from the mix. The lime juice brightens the yogurt, and the tiny flecks of minced jalapeño promise a gentle warmth. This emulsion acts as the glue for the salad, coating ingredients without making them heavy. If the dressing seems too thick, a splash of water or extra lime juice will loosen it; too thin, add a touch more yogurt. A typical pitfall is under-seasoning the dressing, which can leave the salad tasting flat, so taste and adjust before tossing.
Pour the dressing over the salad and toss until well combined.: As you dress the salad you should immediately notice how the tangy yogurt adheres to the shredded cabbage and beans, mellowing the sharper notes of red onion and radish while amplifying their flavor. Use gentle folding motions to avoid crushing the avocado , and toss until the dressing lightly coats each piece rather than pooling at the bottom. The goal is an even distribution so every bite has a balance of texture and flavor. If the salad looks watery, you likely added too much dressing or let the beans sit in liquid; drain excess liquid and toss again. Overmixing can bruise delicate items, so keep your movements deliberate and light.
Top each tortilla with the salad. Serve with lime wedges. Enjoy!: When assembling, place a generous mound of salad onto each crisp tortilla and watch the layers come alive, with the pale green avocado and white beans contrasting against the golden shell. The first bite should offer the crack of the tostada followed by the interplay of creamy, tangy, and crunchy components. Squeezing fresh lime from the wedge right before eating brightens aromas and sharpens the flavors, making each mouthful vivid. A common error is to assemble too early; doing so will soften the tortilla. Assemble right before serving to maintain that delightful brittle texture.