Heat oven to 375.
In skillet, cook sausage over medium heat, stirring frequently, until thoroughly cooked; drain. Return sausage to skillet, stir flour into sausage. Over medium heat, gradually add milk, cooking and stirring until bubbly and thickened. Stir in salt and 1/4 t. pepper. Remove from heat; set aside
In small bowl, beat eggs, half n half, parsley flakes, garlic salt and remaining pepper; whisk until well blended; set aside.
In another skillet melt 1/2T. butter over med-high heat. Stir in potatoes; cook about 5 minutes, stirring frequently, until lightly browned and almost fork-tender. Reduce heat to medium-low; stir remaining 1/2 T. butter into potatoes. Pour egg mixture over potatoes; cook, folding potatoes into egg mixture, just until firm and moist. Remove from heat; set aside.