Chicken and Vegetable Casserole

Ingredients

• 1/2 cup butter, softened
• 1 cup sour cream
• 1 large egg
• 1 cup all-purpose flour
• 1 teaspoon baking powder
• 1 teaspoon salt
• 1/2 teaspoon rubbed sage
• 1 package (16 ounces) frozen mixed vegetables, thawed
• 2 cups cubed cooked chicken or turkey
• 1 can (10-3/4 ounces) condensed cream of mushroom soup, undiluted
• 1/2 cup chopped onion
• 1/2 cup shredded cheddar cheese