Smashed Idaho Potatoes

The amount of milk and cream may differ if you use another potato
1 tsp. minced garlic (optional),
3 T. butter,
1 lb. 3 oz. peeled potato,
3/4 tsp. salt,
1/4 tsp. pepper,
1/4 c. heavy cream,
1/4 c. milk.
2 to 3 portion