This chocolate fudge sauce is so easy, you'll never use store-bought again.
Melt butter and chocolate chips in a small saucepan over lowest heat setting, stirring with whisk or heat-proof spatula.
Add sugar and continue stirring over low heat until sugar is dissolved, about 10 minutes.
Whisk in milk and continue cooking over low heat until sauce is warm throughout.
Pour over ice cream and serve.
Store in microwave-safe glass jar, refrigerated. To reheat, uncover and microwave jar at 50% power for 1 minute. (Microwave cook times may vary.)