Preheat the oven to 350F (177C) convection and grease a donut pan with baking spray. If you only have one donut pan with 6 molds, you bake one batch at a time.
Place the oil, sugar and eggs in a large bowl and whisk aggressively for 1-2 minutes until it's lightened in color.
120 mL (1/2 cup) canola oil, 250 grams (1 1/4 cup) granulated sugar, 2 large eggs
Add the sour cream and vanilla and whisk just until it's well combined.