Whisk 1 cup yogurt, garlic, lemon juice, oregano, ½ tsp salt, and pepper in a bowl. Add tenders, coat, cover, and chill 30 minutes. I sometimes do 15 if we’re starving.
Heat 2 tbsp olive oil in a skillet over medium. Shake excess marinade off tenders. Cook 3–4 minutes per side until golden and internal temp reads 165°F.
For tzatziki, squeeze grated cucumber to remove water. Mix 1 cup yogurt, cucumber, 1 tbsp lemon, dill, and ½ tsp salt. Taste and adjust.
Serve tenders with tzatziki for dipping. My kids dip everything and usually ask for seconds.