1Spray 3 1/2- to 4-quart slow cooker with cooking spray. Layer half each of the potatoes, onions and garlic in cooker. Mix pasta sauce, half-and-half, salt and pepper; spoon half of mixture over potatoes and onions. Layer with remaining potatoes, onions, garlic and sauce mixture. Do not stir.
2Cover and cook on high heat setting 3 to 4 hours.
3About 30 minutes before serving, sprinkle peas over potato mixture. Cover and cook on high heat setting 20 to 30 minutes or until peas are hot. Stir gently before serving.