1. Heat a medium saucepan over medium heat. Add canola oil to pan; swirl to coat. Add onion, cumin, kosher salt, and paprika to pan; cook 8 minutes, stirring occasionally. Increase the heat to medium-high. Add minced garlic; sauté 1 minute, stirring constantly. Stir in tomatoes and chicken stock; bring to a boil. Reduce heat; simmer 15 minutes, stirring occasionally. Remove from heat; stir in half-and-half.
2. Place half of tomato mixture in a blender. Remove center piece of blender lid (to allow steam to escape); secure blender lid on blender. Place a clean towel over opening in blender lid (to avoid splatters). Blend until smooth. Pour into a large bowl. Repeat procedure with remaining tomato mixture. Top with parsley and freshly ground black pepper.