Make the pickled onions (10 minutes): In a small saucepan, bring vinegar, water, sugar, and salt to a simmer. Stir to dissolve.
Place sliced red onions in a heatproof jar. Pour hot liquid over onions, press to submerge, and let sit at room temp while you cook. They’ll turn bright pink and tangy.
Prep the Instant Pot base: Turn the Instant Pot to Sauté.
Add olive oil, diced onion, and bell pepper. Cook 3–4 minutes until slightly softened. Stir in garlic, cumin, chili powder, smoked paprika, oregano, salt, and pepper.
Cook 30 seconds until fragrant.
Add the main ingredients: Add sweet potatoes, black beans, corn, and broth. Stir to combine, scraping up any browned bits from the bottom to avoid a burn warning.
Pressure cook: Seal the lid and set to Manual/Pressure Cook on High for 2 minutes. Yes—just 2 minutes.
The sweet potatoes will finish as the pot comes up to pressure and during the release.
Quick release: When the timer beeps, immediately quick release the pressure. Open the lid and gently stir. Squeeze in the lime juice and fold in cilantro if using.
Taste and adjust salt or spices.
Make the chipotle-lime yogurt sauce: In a bowl, whisk yogurt, chipotle, lime zest, lime juice, olive oil, and salt. Add a splash of water to reach a drizzly consistency. Adjust heat by adding more chipotle to taste.
Assemble the bowls: Add a base of rice, quinoa, or greens to bowls.
Spoon over the sweet potato mixture. Top with pickled onions, sliced jalapeños, avocado, cilantro, and pepitas if using. Finish with a generous drizzle of the chipotle-lime yogurt sauce and a squeeze of fresh lime.