Whisk eggs, chopped chives, and 1/4 teaspoon fleur de sel in medium bowl until well blended. Melt butter in heavy medium nonstick skillet over medium heat. When foam subsides, add eggs and stir with heatproof silicone spatula until eggs are almost cooked but still runny in parts, tilting skillet and stirring with spatula to allow uncooked portion to flow underneath, about 2 minutes. Remove from heat. Add ricotta and stir just until incorporated but clumps of cheese are still visible.
Arrange 2 toasts or 4 baguette slices on each of 2 plates. Spoon scrambled eggs atop toasts. Sprinkle with more fleur de sel and pepper. Garnish with whole chives, if desired.