I finally found an awesome buttercream frosting recipe that doesn't require marshmallow cream

Vanilla buttercream frosting
1C Butter (Softened)
3t Vanilla
4T Milk or cream
4C Icing Sugar
beat butter butter, vanilla & milk until fluffy & add icing 1C icing sugar at a time. Can be coloured.

Chocolate buttercream frosting
1C Butter (Softened)
2t Vanilla
4T Milk or cream
*2-3T Cocoa
4 C Icing Sugar
beat butter butter, vanilla & milk until fluffy, sift in cocoa, add icing 1C icing sugar at a time
*I use 2T if I'm frosting a vanilla cake or something that I don't want a strong chocolate taste on & 3T if I'm frosting a chocolate cake & want it even more chocolatey