Begin by cubing 7 ounces each of gouda and provolone cheese. Dust with corn starch and set aside.
In a large saucepan, pour in 1 cup of beer and heat over medium heat until warm but not boiling.
Add the minced garlic to the saucepan with the beer and sauté for 1–2 minutes, stirring occasionally, until fragrant.
Gradually add the grated gouda and provolone cheese to the warm beer mixture, a handful at a time. Stir continuously to ensure the cheese melts smoothly and the mixture becomes creamy.
Stir in 1/3 cup of Miller’s Mild Banana Pepper Sauce for a spicy kick. Continue stirring until everything is fully combined and the fondue is smooth and creamy.
Transfer the fondue to a serving bowl or fondue pot and serve immediately with bread cubes, pretzels, veggies, or anything else you'd like to dip!