Eating reasonable portions of healthy fats will not make you fat. Use grassfed butter or olive oil for cooking, put a pat on your veggies. 1 TBSP of butter is ~100 calories. Don't be excessive about it, it is a cooking medium and a flavor enhancer, not something to just eat for the hell of it.
Continue to avoid unhealthy fats, like canola oil. Do eat fatty steak like grassfed ribeye, eat less fat from factory farmed poultry.