Add the cream to a medium-sized mixing bowl or food processor then add the powdered sugar (to taste), skimmed milk powder, and vanilla to the cream.
Using a food processor or mixer, whip the cream until it thickens (this doesn't take long at all, so check often).
When you run a spoon through it, and it holds its shape without falling back into the gap, it's ready to use.
This recipe yeilds about 2 cups.
Video
Notes
Use Cold Cream. Chilled cream whips up the quickest.
Be careful not to overwhip - the mixture can quickly go from cream to butter if over whipped. See the post and video for examples of what it looks like when it's whipped enough.
Powdered skimmed milk Can be found in most supermarkets, but you can buy also buy it here on Amazon (#paidlink)
To add color, use gel or paste food coloring and add it before you start whipping, and adding it later may cause it to lose its structure.
Don't leave in a hot environment for too long. The cream will soften too much or melt.
Stored in an airtight container, this recipe keeps well in the refrigerator for 3 or 4 days, but be sure to check the date on your cream before starting.