In medium bowl stir together eggs, sugar, oil and vanilla.
Gradually add flour.
Drop by rounded teaspoonful onto lightly sprayed cookie sheet.
Bake 8-10 minutes @ 400*.
Hint: Cookies can be made thicker or thinner by adding more flour or decreasing it. I like my cookies soft , so I only bake my cookies for 8 minutes. If you like crispy cookies bake them for the whole ten minutes.