Princess Potatoes

Ingredients

• 3 Tbsp. butter
• 4 Tbsp. flour
• 1/4 tsp. salt
• 1/4 tsp. pepper
• 2 1/2 c. sliced cooked potatoes
• 4 hard-cooked eggs, sliced
• 1/4 tsp. celery salt
• 2 Tbsp. chopped peppers
• 2 Tbsp. chopped pimentos
• 2 c. milk
• 1 medium onion