Cook the udon according to package instructions. Before draining, reserve ½ cup of the cooking water.
Cook the bacon in the oven or a pan until it reaches your desired crispiness. Set aside, then chop into bite-sized pieces.
In a pan over medium heat, melt the butter. Add the garlic and sauté until fragrant (about 30 seconds). Stir in the gochujang, soy sauce, and sugar until well combined.
Lower the heat and pour in the heavy cream, stirring until the sauce is smooth.
Add the cooked udon noodles to the pan along with a splash of the reserved udon water. Toss until the noodles are evenly coated and the sauce reaches your desired consistency. Add chopped bacon and top with green onions.
Enjoy.