Mix the dry ingredients (flour, salt, cream of tartar) together in a large plastic bowl.
Create a hole in the middle of the dry ingredients and add the wet ingredients (boiling water and vegetable oil.) If you want one color of dough, add your food coloring now.
Using a spatula, combine the ingredients together into a dough.
If you want multiple playdough colors, separate the colors into smaller bowls and add food coloring. Stir the color until it mixes in.
Using gloves or plastic bags on your hands as a protective barrier, knead the dough to work in the color over wax paper or parchment paper.
Mix in glitter or any extra playdough accessories.
Once your dough is cool, play with it and have fun!
Store your dough in an airtight container.