Shrimp Thermidor

Ingredients

• 2 tablespoons butter
• 1/4 cup sliced green onion
• 2 tablespoons diced green bell peppers
• 1 (10 3/4 ounce) can condensed cream of potato soup
• 3/4 cup half-and-half cream
• 4 slices American cheese
• 2 tablespoons lemon juice
• black pepper
• 1/2 teaspoon dried tarragon
• 1/2 teaspoon ground mustard
• 1 1/2 cups cooked shrimp, peeled,tails removed
• 2 cups cooked white rice