First step, Heat oven to 375 degrees. Coat a 9x13 baking pan with cooking spray.
After it, In a skillet, cook onion in olive oil over medium high heat until translucent. Add in ground beef and cook until browned. If there is a lot of fat from the ground beef, pour it off at this time.
Step three, Add in the flour and cook for one minute, stirring.
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