Spoon over the cherry tomatoes and sprinkle with the remaining chopped mint.
Cut the cherry tomatoes in half and mix in a bowl with half of the extra virgin olive oil and most of the lemon juice.
Place crumbled feta into a food processor along with the yogurt and pulse until smooth.
Drizzle in half of the olive oil while running the processor on low.
Transfer to a bowl and stir through the remaining olive oil, black pepper, 2/3rds of the chopped mint and 2 tsp lemon zest.
Stir through the remaining lemon juice (if desired) before spreading on to each bagel half.
Spoon over the cherry tomatoes and sprinkle with the remaining chopped mint before serving.