Preheat your oven to 400°F (200°C). Line a large sheet pan with parchment paper.
Toss the halved baby potatoes in a mixing bowl with 1 tablespoon olive oil, ½ teaspoon dried parsley, thyme, smoked paprika, salt, and pepper. Spread the potatoes on the sheet pan and bake for 15 minutes.
While the potatoes are roasting, prepare the tilapia. In a small bowl, mix the remaining olive oil, lemon juice, garlic, parsley, thyme, paprika, salt, and pepper. Brush the mixture generously over both sides of the tilapia fillets.
Remove the sheet pan from the oven and push the potatoes to one side. Place the tilapia fillets on the other side of the pan.
Bake for another 12-15 minutes, or until the tilapia is flaky and opaque and the potatoes are tender.
Garnish with lemon slices and fresh parsley before serving.
