Cheesy chicken and vegetable pancakes

Ingredients

• 3/4 cup all-purpose flour
• 1 egg (beaten)
• 1 1/4 cups 1% milk
• 2 tbsp canola oil
• 1 cup frozen peas
• 1 2/3 cups frozen broccoli florets
• 1 tbsp butter
• 1 small onion (finely chopped)
• 1/4 cup all-purpose flour
• 1/2 lb skinless roast chicken meat (cut into thin strips)
• 2 tsp fresh tarragon (or 1 teaspoon dried tarragon, chopped)
• 2 tbsp aged cheddar or Parmesan cheese (finely grated)