Yes, bearded dragons can eat hard-boiled eggs.
Hard-boiled eggs consist of egg white and the yolk that is inside of it.
Egg whites are high in protein (which bearded dragons need) and contain little to no fat, making them a healthy choice for your dragon.
The yolk also contains protein (though not as much) which can be great when your bearded dragon is in the breeding season.
Bearded dragons are reptiles, and they require a high amount of calcium in order to maintain their bones.
The egg white consists mainly of water, but also contains a trace of calcium, making it a perfect food to feed to your dragon.
The yolk also contains calcium, but not as much. At the end of the day, hard-boiled eggs are considered healthy for bearded dragons because they provide lots of protein and calcium.
Bearded dragons should only eat 1-2 teaspoons of hard-boiled egg 2-3 times a week in order to maintain their health. Bearded dragons should not eat hard-boiled eggs for every single meal since it can constipate them and affect their weight.