Lightly brush baguette slices with 3 tablespoons of olive oil. Arrange in a single layer on baking sheet. Broil on high until lightly golden and toasted, about 1 minute. Remove from oven.
Meanwhile, heat remaining 1 tablespoon of olive oil in heavy large skillet over medium heat. Add garlic and garlic scapes and stir for 15 seconds. Add beet greens and sauté until tender, about 3 minutes.
Place toasted baguette slices on a platter. Top with sautéed beet greens. Sprinkle with coarse sea salt and serve.
