Briefly rinse frozen beans in hot water from the tap to lightly thaw. Start heating a large, nonstick frying pan, skillet, or wok over medium-high heat. Add the whipped butter and let it brown just slightly (about a minute), stirring constantly.
Add the green beans and sauté about 2 minutes, stirring often. Drizzle Amaretto liqueur over the top and continue to sauté 2 to 3 minutes more or until beans are still a nice green and just tender.
Spoon the green beans into a serving bowl and sprinkle the almond slices evenly over the top.