In a bowl, combine flour & salt. Whisk in milk until mixture is smooth.
Heat a small non-stick skillet or crepe pan (6-8-inches) over medium-high heat. Brush bottom of pan with oil. Using a 1/4 cup measure of batter, add to pan & quickly tilt pan to cover bottom with batter.
Shake pan to loosen crepe & cook until edges of crepe begin to curl & it no longer sticks to the pan, about 30 seconds.
Gently flip crepe over & cook for a few seconds. Remove from pan & set aside. Repeat with remaining batter.
If you are using broccoli florets, cook in microwave for 1 or 2 minutes to precook slightly.
Preheat oven to 375 F. Set out a 9 x 13-inch baking pan.
Set aside 1 cup of the sauce. Into remaining sauce add the chicken, broccoli & 1/2 of the grated cheese; gently combine.
Spread a small amount of reserved sauce in bottom of baking pan. Divide filling between crepes. Gently fold each side of the crepe to the middle. Place crepes seam side down in baking dish & top with 1/2 of sliced green onion, remaining sauce & cheese.
Since the sauce is fairly thick, I set the pan of crepes into another pan that had about 1/2-inch of water in it to create a ‘water bath’. This helped them to cook without getting to crisp on the bottom.
Cover the pan with a sheet of foil & bake for 30-45 minutes. Remove from oven & sprinkle with remaining green onion. Serve.
Recipe Notes
If you would prefer to make smaller crepes, use a 1/8 measuring cup or 2 Tbsp instead of the 1/4 cup measure. It should give you roughly 10 crepes.