The quick frosted glass material is a mixture of glass, basic and coating layers. The result of course is not the same as using only a glass Layer but it could save you lots of render time in many cases.

Glass layer

• Create a glass layer
• Remove roughness by setting it to 0%
• Remove reflections
• Click on the hamburger icon and check reflections
• Set the reflection color to black

Basic layer

• Create a basic layer and move it on top of the glass one
• Set the color to white (RGB: 220,220,220)
• Adjust the layer weight to a value other than 100% (e.g. 20%)

Coating layer

• Create a coating layer
• Adjust the roughness of the reflections based on the look you are after