Put the cottage cheese and goat cheese in a mini food processor or blender and run until creamy and smooth. Alternatively, vigorously stir together in small bowl with a fork.
Cut four 1/2-inch-thick slices from the center of the bread so they are generous in size (leftover bread can be saved for another use). Brush lightly with olive oil using a pastry brush or drizzle with a spoon and season both sides with a pinch of salt.
Lay the vegetables on the grill and cook until tender and glossy, turning as needed, 5-10 minutes. Lay the bread on the grill and cook until both sides are lightly brown and a little crisp, 2-3 minutes.
Spread the cheese over the grilled bread. Divide the vegetables over the bread. Squeeze the lemon juice over the vegetables and scatter the mint over everything.