For crepes, combine flour and egg replacers in a medium bowl. Slowly stir in the milk and beat with a wire whisk until the batter is smooth.
Pour ¼ cup batter in nonstick skillet or crepe pan. Tilt and rotate the skillet to distribute the batter evenly over the bottom of the pan. Cook for 1 minute or until bubbles appear on surface of crepe. Turn the crepe over and cook briefly on the other side. Repeat this process with the remaining batter.
Preheat oven to 350°F.
For the filling, sauté asparagus in ¼ cup vegetable broth in a large skillet over medium-high heat until tender.
Add garlic, lemon juice, tarragon, onion powder, and salt. Sauté for 1 minute more. Set aside.
To assemble, place asparagus in center of crepe. Roll up and place in a large baking dish.
Cover and bake for 15 minutes. While crepes are baking, whisk together sauce ingredients, and after crepes are baked, spread the sauce over the top of each crepe. Serve immediately.