Cut large potatoes into quarters and small ones in half. Place in a medium saucepan filled with just enough water to cover potatoes. Cover and bring to a boil. Reduce heat and simmer until potatoes are very tender, 10 to 15 min.
Meanwhile, generously sprinkle both sides of chicken with Tex-Mex seasoning. Heat oil in a large non-stick skillet over medium heat and cook chicken until cooked through, about 4 min. per side. Transfer to a plate and cover to keep warm.
Add corn, tomatoes and lime juice to skillet. Cook until vegetables are hot, about 3 min. Tomatoes will remain whole but slightly softened. Add zest and stir.
Drain potatoes and return them to saucepan. Set saucepan over low heat and add yogourt and salt. Using a potato masher, roughly smash the potatoes, then stir in chives. Divide corn mixture between plates, top with chicken and serve potatoes on the side. Garnish with lime wedges, if desired.
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