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1) In a medium saucepan, melt 4 tablespoons of butter over medium-low heat. Be careful not to burn the butter.
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2) If the butter is hot enough that a sprinkled pinch of flour added begins to bubble then add the 4 tablespoons of flour to the melted butter.
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3) Wisk the flour into the melted butter until a rough, thick paste forms. Continue whisking constantly until the mixture begins to become smooth and slightly thinner
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4) Add the milk while stirring. Turn the heat to medium-high and stir until smooth. Heat the milk until it is lightly bubbling then turn the heat back to medium.
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5) Add both kinds of cheese 1/4 cup at a time, waiting until all the cheese is melted before adding more again.
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6) Once all the cheese has been melted and the sauce is consistent turn the heat the low to maintain thickness until it is time to add it to the pasta.
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7) In a large skillet over medium-high heat melt 4 tablespoons of butter.
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8) Add the bell peppers and onion. Add a pinch of salt and saute until the onions are slightly browned
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9) Once the peppers and onions are sauteed add the seasoned steak and cook for 4-5 minutes or until it reaches desired doneness
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10) Add steak and vegetables to the pasta and pour the cheese sauce over. Mix.
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11) Salt and pepper to taste and serve warm!
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NOTE: You can melt additional cheese over the top!