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Spray 6-quart Instant Pot® insert with cooking spray. Add water, macaroni and salt to insert; stir.
Secure lid; set pressure valve to SEALING. Select MANUAL; cook on high pressure 5 minutes. Select CANCEL. Set pressure valve in VENTING position to release pressure. Add milk, mustard, pepper, cheeses and 2 tablespoons butter. Carefully stir until cheeses are melted.
Meanwhile, in 8- or 10-inch skillet, melt 1 tablespoon butter over medium heat. Stir in bread crumbs and garlic powder. Cook 2 to 3 minutes, stirring frequently, until lightly browned. Sprinkle over macaroni and cheese before serving.