Preheat the oven to 350 degrees F. Warm the taco shells on a baking sheet, about 5 minutes.
Crack the eggs into a bowl, add the taco seasoning and whisk well with a fork. Heat a medium nonstick skillet over medium-high heat. Melt the butter in the skillet; when it foams and bubbles, add the eggs and reduce the heat to low. Cook the eggs, stirring regularly with a wooden spatula to break them up, until set, 3 to 4 minutes.
Line the center of each taco shell with about 2 generous tablespoons of the scrambled eggs. Top with some of the cheese, scallions and lettuce and a spoonful of salsa. Garnish with some chopped tomatoes, and serve with olives and sour cream on the side if using.
Never leave a child unattended in the kitchen. Limit the child to tasks that are safe and age-appropriate.
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