In a 12-inch cast-iron skillet, cook bacon over medium heat until crisp, about 12 minutes. Remove bacon using a slotted spoon, and let drain on paper towels, reserving drippings in skillet.
Add onion to skillet; cook until tender, about 6 minutes. Add garlic; cook until fragrant, about 1 minute. Stir in peas, broth, salt, and black pepper, and cook until peas are tender, about 30 minutes.
Working in batches, stir in Swiss chard, cream, and red pepper. Cook until greens are wilted and sauce is slightly thickened, about 5 minutes. Top with bacon, and garnish with red pepper, if desired.
Recipe by Southern Cast Iron at https://southerncastiron.com/field-pea-chard-saute/