Use an electric mixer to work the cream cheese and sugar together in a large bowl. Continue until the mixture looks smooth, without visible cream cheese lumps.
Blend in the sour cream, vanilla, and salt, then incorporate each egg separately on low speed, stopping as soon as it blends in. The batter should become creamy without turning foamy.
Scrape the bowl’s bottom and sides, then mix for about 30 seconds more. The batter should have a consistent texture with no dense streaks clinging to the bowl.
Fold the chopped Mini Eggs through the filling with a spatula. The candy pieces should be distributed throughout the batter.
Fill the chilled crust with the batter, place the springform pan on a baking sheet, and bake for 55 to 65 minutes. Expect noticeable puffing, a set outer area, and a center that barely trembles when the pan is gently tapped.
Transfer the pan to a wire rack, wait 10 minutes, and carefully pass a knife between the cheesecake and the pan’s edge. Releasing the edge lets the cake shrink as it cools without pulling against the sides.
Let the cheesecake reach room temperature, then loosely cover it with plastic wrap and refrigerate overnight. The cake will settle as it cools, and waiting before covering prevents trapped steam from dampening the crust.