I first tried this appetizer at a ladies tea many years ago. The hostess was adamant about not sharing her secret appetizer recipe. After searching the internet for possible matches, this is what I came up with. My family absolutely loves it! It can be prepared ahead of time and frozen for up to a month before baking, which is perfect for when unexpected company comes by (or when you just feel like having a snack)!
In a large skillet over medium heat, brown and crumble sausage until no longer pink. Remove from heat and drain off drippings. Add green onions, sour cream, mayonnaise, cheese, and garlic powder; mix well.
Top toast squares with about 1 heaping tablespoon of the sausage mix. Bake for 20 minutes until bubbly. Garnish with additional sliced green onions if desired.
NOTE: To make this ahead of time, top toast squares as directed then place in the freezer. When ready to bake, remove the squares from the freezer and bake for 25-30 minutes or until the topping has browned slightly and becomes bubbly.
VARIATION: Use Phyllo cups instead of toast squares. Fill cups and bake as directed; garnish with a sprinkling of sliced green onions on top.