Bring a large pot of water to boil. Cook the pasta according to package directions. Drain and set aside.

In the same pot, melt the butter over medium heat. Add the flour and whisk for 1 minute or until lightly browned.

Add the milk, garlic powder and salt and whisk to combine. Bring to a simmer and turn off the heat. Add the white cheddar cheese and mix until melted and smooth.

Add the cooked pasta to the pot and combine. Mix in the peas and ham just until combined. Serve immediately.