In a large Dutch oven over medium heat, cook the diced bacon until crispy, about 8-10 minutes. Using a slotted spoon, transfer the bacon to a paper towel-lined plate. Leave about 1 tablespoon of bacon grease in the pot, discarding the rest.
Add the sliced smoked sausage to the pot. Cook for 3-5 minutes, stirring occasionally, until browned and slightly crisp. Remove sausage from the pot and set aside with the bacon.
Add the diced onion and jalapeño to the pot. Cook for 3-4 minutes, or until softened. Add the garlic and cook for 1 more minute, stirring constantly.
Sprinkle the flour over the vegetables. Stir continuously for 1 minute to form a roux. Slowly pour in the chicken broth while whisking to prevent lumps. Then add the milk, continuing to whisk until smooth.
Add the potatoes. Stir well, cover, and reduce heat to medium-low. Simmer for 15-18 minutes, or until the potatoes are fork-tender.
Stir in the creamed corn, sweet corn, salt, black pepper, chili powder, and crushed red pepper flakes. Mix until everything is well combined.
Carefully transfer about half of the soup to a blender and blend until smooth. (Remove the center cap of the lid and cover with a kitchen towel to allow steam to escape.) Return the blended soup to the pot and stir to combine.
Add half of the cooked bacon and all of the smoked sausage to the chowder. Simmer for 3-5 more minutes, just until heated through.
Serve warm, garnished with the remaining bacon, chives, and jalapenos.